have you tried filing the back of the trigger...since you say it doesnt feel like it has enough pre travel? that was a common issue with the dye/32* frames
On a recent classic mag semi to pump conversion, I put a eBay purchased single finger 45 frame to put on it and when to
Ok here's some quick photoshopping to try to visualize things.
This is photoshopping so some deformation has occurred on the ones I straightened.