Am I folding this AJ to a shove?

[allenciox]

Nope, once you raise preflop, you are committed to calling his reraise, there is no "safe" amount to reraise.

But reraising an EP raiser here is just simply bad poker. If he calls you are in bad shape --- stack sizes are not good for a raise here.

On the other hand, if you really think you are ahead of his raising range, then call in-position. Often you can pick up the pot postflop even when you miss. Remember, don't be in a hurry to resolve a hand when in-position, particularly when calling a raise is around 10% or so of your effective stack.

Personally, I would usually fold here against most opponents. Against a bad player that I can read well post-flop I will call. But I would never raise with these stack sizes, in-position as you are.