Hey guys I have 4 brand new Hitech 945's in my 80" Cap. There are 2 on the ail and 2 on the elev. The problem is I cannot get these things to center the same way twice. Also on my elevator 1 servo doesn't move until the other one is about 3 degrees. Sometimes if I move the stick 1/16" neither servo moves. They are on a properly set up matchbox. Is this just normal for a non digi servo or do I have a bad batch of four, because my ailerons act very similar. If I have to get new servos which ones 5645's or 5625's? Any help would be appreciated.