I have what is (judging by the Gamo logo on the side) an early model.

The adjustment screw is a longer one fitted by the previous owner. The sear faces were apparently polished by the previous owner. Both these actions are the mods usually qouted to improve the trigger.

With the screw out (full sear engagement) the trigger has a short first stage, and a long creepy second stage - not nice.

With the screw further in (less sear engagement), the first stage is long and clean, and the second stage is crisp and consistant - very good (but not as good as the HW40).

Not sure about raising the trigger blade, I do however make use of the trigger blade rotation.