Point of concern. Area in datalog at 11:45. Lean off when returning to idle after prolonged overrun imediately after a power run. This can be repeated

Engine is an overbored 998 Austin A series fitted with a supercharger kit. Injectors are installed after the throttle but before the supercharger. Water/ Methanol injection installed

Any suggestions welcome on any aspect of the config, but we really need to get to the bottom of the leaning off issue above.

Thanks