That's funny, i found the 300c turns in & manuvers alot better than i expected (considering its heavy weight and large stature). A lot less understeer and fishtailing than i expected. What level of racing are you at? Are you trying to finish a race series, or just doing time trials? How much power are you using? i'm just curious.
I just found the 300c needs some earlyish, heavy/firm braking before tight corners...and this way you avoid any mid-corner understeer. And since it's RWD with fatter tires in the rear, you can hit the gas early. Hmmm. Anyways, i'm curious.