Hi guy,
Been flying a Nexus 30 for 5 months now. Many moons ago, I removed the brass/bronze bushings in the tail pitch slider, and replaced them with ball bearings my LHS had in stock. Solved tons of problems with that problem. The LHS charged me $10.00 for the set. Kyosho has them as an upgrade, but they wanted $14.00 for the same thing. Oil them with real light weight oil, like turbine oil, and keek oiling them on a regular basis.
Only upgrade on this bird except Century blades (wood), and this thing flys great. Lots of luck..... Jack Hall