When you use a degree wheel make absolutely sure you have an accurate TDC. You can't just push the piston to the top and say that's TDC. You need to bolt something to the top of the engine that will hold the sleeve in place and stop the piston approximately 20 degrees before TDC. You need to get the same degree reading when turning the crank in both direction to the stop. Then 0 degrees will truely be TDC.