Well, my leaves just aren't looking the greatest on my trees. I dont know what to do.. from looking up info online about what diefiencies I have... it looks to be well, everything.

How long doies it take for the problem to be corrected with the proper fertlizers? will it show on old leaves or only the new ones? Because even some of my new growth is coming in so incredibly light green (NOT typical light green growth... I have 2 other incredibly healthy trees... very different)

DEFINATLY a maganese, iron and magnesium. those are the biggest.. possily a zinc.

I know I'm using a decent fertlizer, but is there many something else I should be doing? I just see it being a really big problem in the future if I dont get it taken care of now. My 2 trees that are just an amazing green... make these trees leaves look almost dead in comparasin

I've put my plants outsde for the first time for the day today, they'll have to come in tonight, but its a start. Hoping with the amazing weather, light breeze, nice heat... will also help.

If that is my tree first thing I am going to do is to give the soil a bath to get rid of everything that is causing it. I mean run your water until the soil is dripping wet for maybe 20 minutes, 30 minutes or more to get rid of all the salts or fertilizers or what you have in the soil.
Once you've done that, let it be. Don't water anymore until the soil dries . You will probably notice new green sprouts will start to come up in a weeks time.
What you are telling us is not enough to diagnose it but the above is my remedy if I don't know what's ailing my plant and always work for me.
I used to have a guava that seemed to have the same symtoms as yours and now I have 4 tomatoes in a wine barrel that starting to yellow their leaves and started to appear brown spots on the leaves. And would not grow whereas the other tomatoes I have in another pot were so lush and green.
I let the water run till the water was up to the brim without spilling over and let it run like that many times in a day.
Then I waited.
In a weeks' time I have all brand new green leaves and flowering. And growing like crazy.
It may or may not work for you but it's a good try.

I've done that. actually the problem worsened afterwards

I don't know what to tell you. Perhaps some experts here will respond to your problem.
Good luck.
Benny

Betty, you worry too much about your plants...maybe killing them with kindness??
Benny gave you good advice that I would do --flush them. It worked for me in past too, but you said it made them worse. This is an ugly spring so far,...cold, ugly, drizzely...not good for our citrus. I'd give it the best light you can give & forget about them for awhile. You say you fertilized. Maybe too much? You know, a lot of us are going thru the same thing but I think we all do a trial & error thing & wait to see what happens. I let my plants dry up (not BONE dry) & then I flush them, as Benny said ( & Millet suggested I do last year), & they came back fine. I don't fertilize when they are dropping leaves & looking like they're dying.
Put them in a sunny window & forget about them. Just add a little epsom salt to water nest time you water.

And there is no such thing as instant cure.
It works gradually.
Many times when you are about to give up that's when you see things happen.
Remember the Meyer lemon I was talking about? Eight months before it responded.
I used to be like you. I panicked right away. When I see something that is not right I want an instant cure. I'd give everything I've got and expect to turn my plant bright and green the next day.
Never happen that way.
As a result it would turn out more worst when I started than better.

You'll find better results usually about 3 weeks if the weather is nice and warm.
You stated that it is not even nice to put your plants outside and the Spring is late forthcoming on your other thread. Maybe that's the problem.
You are not alone. When the weather is like that my plants also react like crazy. It will give similar symtoms like what you describe.
I don't worry about it anymore.
When the weather becomes nice and warm constantly, they will replaced those ugly old leaves with bright new young ones.
And that's why citrus is fascinating to grow. They will give you heart failure one time and juvilation the next.
And BTW (By The Way) It was Millet who adviced me this years ago.
Benny

And all of my citrus react differently. Some would give me heartattack and some would give me juvillant emotion. And there is always that black sheep in the family. No matter how you treat it , it won't respond to anything you do.
When that happens, out it go to the dumpsters after I lose a gallon of sweat.

I might add what Millet said on another thread

"Know that citrus trees ALWAYS, ALWAYS absorbs fertilizer nutrients in the ratio of 5-1-3 ALWAYS!! In otherwords, for every 5 parts of nitrogen absorbed by the tree's root system, the tree will always take up only 1 part of phosphorus, and then 3 parts of potassium. For CONTAINERIZED trees, this ratio must be respected as close as possible. Lastly, for trees as small as yours, I would also only fertilize at 1/2 the recommended rate untill they get a little more size to them. - Millet"