I use the HD SE clutch spring and I never had the clutch slip at any RPM or riding situation. I think in most cases the clutch slipping would be a clutch adjustment issue on the 103 or 110 engines no matter what upgrades the bike has.
I also installed the SE clutch plates which eliminates the damper spring and damper spring seat and replaces those parts with full size clutch plates.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.