Androgen supplementation always decreases SHBG, not the other way around. So I don't know where you picking that up, it is pretty common knowledge that the introduction of androgens reduce SHBG.
Trust me when I say there is no way to increase it, I know a few guys that have been on the boards for years, and they low SHBG and have no way to fix it.
If your SHBG is low you have no business on an Aromatase inhibitor.