Trying to tune SLP performace edition package (head/pipe/porting/reeds) in my 2003 800 rev (ho ported cylinders). My current needle is the 07-58 and SLP recommendation is 13-58. What needle is leaner? I am horribly rich currently but am still running the 470 mains at 1000ft so will likely drop to 450. 3/4 throttle gives me more rpm than full throttle. Again what needle is leaner of these two please and thanks.