Hey Tire Iron, I also just did my first conversion , and have pretty much the same set up as you, 3 hole gun with the same mods you have made. And got the same results first time out to the range, with the the bird shot loads. The gun ran fine with OO and slugs. So I polished the bolt as advised on one of the treads here, used the lapping compound trick as mentioned in a reply on this thread and got the reduced power springs, but only replaced the front one and left the stiffer stock spring at the back of the recoils spring guide (behind sliding dust cover). Next time to the range.....,
S