well i changed the pinion to the 11T and loosened the belt and gear mesh. i bought a triton charger and wow 10 minute flights. I only have a three point curve and the settings on trex tuning do not work so i am playing with pitch. wife purchased a small digital 100g scale on ebay for 8 bucks i use it to weigh blades really useful takes all vibration out! i really think the older charger was not fully charging! The triton is an awesome charger for 125 comes with a temp sensor!