Did you replace the piston guides as well as the seals? If they've taken a knock the guide can beccome oval in shape and allow the piston to slop about from side to side too much.
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Losi Eight T - Nova Rossi P21-7T- Hitec 5955's & Spektrum + TeknoRC Losi 8ET - Neu 1515-1Y - MGM 16025 & Hitec 5995's.
RC Heli's - Align T Rex 600 Nitro Sport - X-Cell Spectra G gasser.