The sear feels rough? Maybe someone tried to lighten trigger pull with a stone and went through the hard facing and the sear is now being chewed up? If you look at some later carbines (Winchester?) you will see a very noticeable section on the sear that is polished at the factory. Early ones not so much. The first thing I'd do is take out the Wolf springs and put them away, get a new sear and change the sear spring to a GI spring. Perhaps someone got a bag of Wolf springs and put the wrong one in the sear? There are no instructions with the Wolf spring assortments.