rather than changing the exp. its sound slike either some sort of linkage problem or the idle may be set to low. you could try also adjusting the trim on your radio. your idle should be set so that it almost engages your clutch. i have never had an issue of having that much throttle before engagement with 1.1 springs i used to run them reguarly. but not drilling the carbon shoes may help as heavier shoes engage sooner and carbons are genrally heavier than alumn. and its seems you have gone from extremes maybe 1.0 springs would be the ticket. you could just run the 1.0 springs with the alumn. shoes i have found that after a few runs the springs soften from the heat so i find its best to run a heavier spring as it may not be the best at first but after its been heat cycled a couple of times its still stiff enough to work properly. i run mugen carbon shoes and 1.0 springs on my p5x but i am gonna give 1.1 a try next.