I'm curious what the results would be with just the connector. Your observation that it gave you a nice rolling break has me thinking that adding it and nothing else might be the fix for my Gen 4 19. I don't have a way to measure trigger weight but it has a very heavy wall that I would like to eliminate.
Did you get a chance to try the Taran connector without any spring changes? Do you feel like the Apex striker block changed the feel at all? What were your reasons for adding it?