setgs fXPStart 200         
// Changes how much exp you need to level up from 1 to 2 (default 200)

setgs fXPBase 75        
// Changes the Increment to exp needed per level (default 75)

setgs fXPExpMult 0     
// Stops fXPBase from increasing in increments of 5 as you level (default 0.0015)