Test prop causes less of a rise in estrogen and DHT at the same dose, but is more anabolic per 100mg because of the ester weight.
Test is not Test. From the studies I have seen, the ester can determine the rate of conversion to both estrogen and DHT.
If you want the most stable blood plasma concentrations possible, injecting a long ester ED or EOD is how you do it.
Letro is overkill.
Aromasin 10mg/ED or EOD is fine.
Start the HCG from week 1 if you have enough, if not week 2-3 is fine.
I use Test Prop EOD and it gives me no more sides/gains, than using it ED. It is, however, best used ED (optimal).