Great! Sounds like a good comparison, I'll be interested in the results. You're changing only the connector and not the trigger spring, right? From what I have read then, I would assume that the trigger pull would be greater than the 3.5# for the 3.5# connector.
If you want to do a gen3 on one of your not NIB glocks, I would still be impressed as the gun being tested is the same for all tests.