I think the variegated pink eureka must be a weak plant compared to other citrus species. I live outside the citrus growing area, but all the citrus plants I have do very well, except the pink eureka. It doesn't want to grow, leaves look ugly and drop off and flowers drop also.
I'm about to replace it by a regular eureka lemon.
I did take a bud from the pink lemon and bud grafted it on one of my other citrus plants. Not sure if it will take... it was the very first time I tried grafting!