I haven't tried the trigger on a modified Gamo compact, so cant compare, but I have to say that I've got used to mine and currently don't find it a problem to get good groups. All three Gamo's that I own have a similar, single stage trigger, which have a clean break. Might be worth trying it first, then if you cant get on with it hand it over to Nick. All i'm saying is don't let the trigger put you off. I think its a lot of gun for the money.
Knowledge is knowing a tomato is a fruit. Wisdom is not putting it in a fruit salad.