Donn it may be my technique , but no matter how well I think I've cleaned mine , there always seems to be some hidden tiny pockets of paint even after a teardown and soaking.
I will admit that my 155 is quite worn and probably overdue for a complete rebuild and tuning.
I just seem to have to spend an inordinate time tearing down and cleaning it.
I don't mind tho , it's my #1 workhorse