Anastrozole dose needs to match your FT/Bio-T levels.
Typical is 1mg for every 100mg T cyp/eth
So you were under dosed. But you are not typical, you are an over responder.
Based on current labs, you can get near the target of E2=22pg/ml with:
1mg/week X 8.1/22 = 0.36mg/week
To manage such small doses you need to dissolve anastrozole in vodka, 1mg/ml and dispense by volume or by the drop.
Inject twice a week to get steady T levels for anastrozole to work best
Take .18mg anastrozole at time of injections
250iu hCG EOD
Do labs half way between injections - always
Your weekly injections are allowing for a lot of unknowns.
Test E2 later and maybe correct again as your weekly injections may have yielded some E2 results that are not solid.
If you reduce T dose, reduce anastrozole again by same factor. You can stack both corrections.
Based on FT=18, I would not reduce T dose without some doubts. Your TT may be strongly weighted by high SHBG that is creating a lot of T+SHBG. High SHBG with lower E2 does not make sense. More FT wound reduce SHBG. Something is not right.
Another possibility would be that SHBG is inflating TT and that you are a hyper metabolizer of T. But we really need the above changes and new labs to get a clearer picture. Can you also directly check SHBG?
SHBG levels increase with estrogenic states (oral contraceptives), pregnancy, hyperthyroidism, cirrhosis, anorexia nervosa, and certain drugs. Long-term calorie restriction of more than 50 percent increases SHBG, while lowering free and total testosterone and estradiol.