I have the iso grips with throttle bosses on both sides to make my hand shape on the grip on non-symmetrical. also an o-ring between the grip flange and the throttle housing really helps hold the throttle position with low effort.

05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter