I've not messed with an Omega yet (might not ever as mine are all under 4 lbs. easily on SA trigger pull).
On the CZ75's I've installed different hammers with original sear, different hammers with CGWs adjustable sear, safeties different than original, etc., etc.
A hammer with a nice crisp release usually has a shallow notch for the sear to sit in. That moves the sear further up at the back when the hammer is cocked - and the front of the sear farther down. That can make a safety made for a stock hammer too "tall" to fit under the sear most of the time.
I've had to stone that cam surface on the CZ75 left side safety shaft (did that once). Since that first time I've just bought the CGW adjustable sear. Not sure if anyone makes parts like that (adjustable sear) for the Omega series yet.
OP, the way you "fixed" your pistol is the only way I know to do it. Glad you got it figured out. Now you're ready to upgrade another Omega.