i got T-6's and my jets they gave me were way lean too, im runnin 320's and its dialed in pretty well dead on, im at about 700 ft at about 20 -30 degree temps
stock pilot jet and what not and air screws i left alone, i would definatley go up to about a 320 , check yer plugs and go from there
HOPE THIS HELPS !!
Matt