I have a dilemma with the twin sync. I bought it over a year ago but just recently started using it with two glow engines. If I leave the throttle stick at a static setting with the twinsync engaged, the engines slowly lose RPM. Moving the throttle stick slightly, either up or down, will cause the engines to rev back to near the original RPM. I've gone over the programming several times to make sure it is set up correctly and it seems to be. Suggestions?