You can try to lean it out just a little more. Im flying using the Vmax7 I have four washers under the head 15% nitro and my needle valve is open a full two turns. When its warm out I open the needle valve an extra 1/8 of an inch. So far This has been the Charm for my heli. Still lots of power. Ive been averaging about 3-6 tanks of gas a day for about two weeks straight. Been on the same glow plug now for about three months of flying. Warm to me is about 70 degrees.