I suggest that because it is readily available for most people, prevents any bacterial activity and anastrozole dissolves in [any] alcohol, but has scant ability to dissolve in water, ie ~.5mg/ml is difficult in pure water, with the fillers in the tablets that may mean that anastrozole is suspended and shaking would be imperative.
You can try aromasin, but dose needs to be small and you are still splitting pills. The problems, that you think you feel, would be caused by low E2, typically not anastrozole itself.
Because of your conflicting observations, you will need to experiment and observe. Making quick dose changes is not helpful. The full effect of any given dose or dose change is going to take a week to eval.
We do not see events were hCG is directly stimulating breast or nipple tissue. Again, your E2 lab does not in any way suggest that hCG dose is too high. With TRT without AI, we see E2 in upper 30s frequently. In any case, whatever you find that works for you is all that matters, we can only suggest based on what seems to work well for almost everyone.
We have a few guys who do better on aromasin than anastrozole [reasons not understood].