The suspension should be set up to drop in the 4" range when you sit on it. You can go a little more (softer), or a little less (stiffer), to suit your taste. With sag set for 1", I can understand why it's so stiff. It's been too long since I've messed with one of those to remember all the setup info. There should be a couple different stickers under the hood with that info. Have you checked them out?
Umm, by the way. I doubt the M-10 would EVER disappoint anyone that enjoys the Extra-12.
'07 Apex RTX w/Pro X suspension conversion, Fox Floats w/resi's, Doo extro drivers, Cobra track, Dual Ryde FX rear clickers, .375 Edge torsion springs, HyGear Dual rate front skid springs, SLP anti-stab kit, Powermadd handguards/mirrors, 2" Rox riser, shimmed Poo skis w/custom (homemade) ski savers, Black chrome W/S, Graphics by Arctic FX, and a grin every time I think about it! New Project: 600HO Fusion bump sled, Air 2.0 w/hi/low valves, HRM spindles, Retro graphics, .359 torsion springs.