That is a very good choice. Makes for a very smooth pull IMO.
I think a 3.5# is fine for carry. Actually, all my Glocks have a 3.5# Glock factory connector in them and I’m happy with the setup. I’ve heard of some people having problems with Lone Wolf 3.5# connectors but, I don’t have any firsthand experience with them.
I like to keep it simple so, I don’t play around with the other springs.
Joe Mamma