The only way you are going to increase acceleration without top end loss is add more power to the motor. Most people go with a 15T front sprocket because the raptor already has tons of low end and the big 3 adds a bit.
Drag...you are going to want the 15T unless you are running paddles.
734 09 Raptor
Meglodon by Bo,KW springs Ferrea valves , Web 4 Cam, 54mm TB, 105.5mm CP cylinder, 14:1 CP, Barkers Inframe, Dynatek Coil, PC V, Dynatek Programable ignition
CCP stabilizer,+5 swinger,Boss Noss Sys, Direct Drive Lock-up, KDS Evac valve,HID Light conversion,SPAL fan
Tuned by EHS Racing 78hp 55Tq