It will not take 3 weeks for levels from 300 mg/week testosterone cypionate to drop back into the normal range and then below.
PCT would be better started 5-7 days after the last TC injection.
HCG in weeks 9-12 would be all that's necessary. For example 250 IU every other day.
As your combination of both EOD and E3D injections will wind up being fairly close to every day anyway, and trenbolone acetate is best used daily, why not just change that to daily.
I would not include the Arimidex after discontinuing the testosterone and Dianabol.
Your SERM dosing would be okay for Nolvadex but wrong for Clomid.