Landmine
Wow....O.k. The use of HCG is probably one of the most debated subjects in AAS. So, I know I am probably stepping on a landmine ...but here goes.
I think the Arimidex you are taking can be spread to every other day at a minimum. You are really not taking that much juice. In my experience, 400mg/week is somewhere near the breakeven point (where the elevated exogenous overtakes the reduction in endogenous). If that holds true for you, you are effectively only bumping T up 100 mg/week. That will not likely lead to high amounts of E. Watch your own body and see. Check for cramps in the calves, itchy nipples, decrease drive, etc.
As for the HCG. HCG does nothing to restore the HPTA axis. All it does is mimics the release of Luetenizing Hormone, which causes the testes to start producing Testosterone. However, it is actually suppressive on the HPTA. Therefore, once you stop HCG you will still experience a rebound effect.
In my humble opinion, HCG should be used as a way to restore testicular size near the end of a cycle, but should be regarded as any other AAS when it comes to after cycle restoration of the HPTA. Therefore, I would use it the last week to two weeks of your cycle and then start a normal Clomid routine. If you don't, I think you will see more side effects.
Hope this helps,
Kemo