I wanted an opinion on whether you think my AI in under dosed, based on test results of my Estradiol levels.

I was running test E 400mg/wk and anastrozole .25mgEOD and mid way through my cycle I got blood results back that showed a very high E level:

Estradiol 72.4 7.6-42.6 pg/mL

Obviously from these results I needed to up my AI so I bumped to .5EOD and had bloods retested about two weeks later:

Estradiol 43.3 7.6-42.6 pg/mL

Is it possible I just have a very high tolerance to anastrozole, or more likely that my gear is under dosed ?
Thanks!