Vikingr

I need some advice. Just fitted a pre B disco in my sp01 shadow. I had to shortsen the wings a bit for the gun to reset properly. The reset and trigger feals great. I have about 1.5 mm freeplay before SA breaks But just before the DA breaks it feels like hitting a wall that you have to push through. I think the trigger bar gets stuck on the disco when it is pushed down by the searhouse to release.. But Im absolutely not sure.. I have deburred and polished everything. Any clues?