Your post actually said that 2nd time you tested high on e2 you were at the same dose, 12.5mg.
But regardless, 25mg isn't going to double the effect over 12.5mg, you might see 10-20% more effect but that's it. AIs only kill E2 in post menopausal women, they have a MUCH lower effect in men. They also have a much shorter halflife in men, aromasin is only a 9 hour halflife in men.
Pharmacokinetics and Dose Finding of a Potent Aromatase Inhibitor, Aromasin (Exemestane), in Young Males -- Mauras et al. 88 (12): 5951 -- Journal of Clinical Endocrinology & Metabolism
A 50 e2 level is totally normal and nothing to worry about on 500mg of test.
where did you see aromasin has a 9hr half life? I thought it was 27-30hrs. Most take it eod. I wonder if its best to split up my adex and aromsain dose morning and night instead of all at once at night.