don't use proscar with deca. It really only works with test, and actually has a negative effect when used with deca (since it prevents deca from converting to a less hair-shedding substance in the scalp).
honestly, with anything under 400mg of test I don't think proscar is really needed. When I've used it I've always felt less "kick" from the test too. I think this is because alot of the effect we get from test is through the large amount that is converted to DHT (which is more androgenic than test).
I think your best bet would be to use a topical DHT blocker. Check out xandrox, nizoral and spirilactone. Nizoral now comes in a concentrated gel, and is both effective and cheap.