Thought I'd posted in here already :roll:
Anyway - welcome :D
I've not tried Slowhands myself, it's not quite the tone I go for first on strats. Neither have I tried baseplates on strat pickups, never really felt the need myself...
BUT, listening to clips, I've reached the same conclusion as you - if I did go for Slowhands, I'd probably go for baseplates all round. It seems to me that baseplates make strat pickups more "Slowhand-like", so if I was after the Slowhand vibe I'd be thinking, yeah, max it out! Whack them baseplates on :D