Personally if your happy with it as it is, then stick with it, But with 30% I'd be tempted to actually FIT another 0.1mm shim, but as you haven't said which engine it is, I don't know the spec's for it and cant really say if it's needed for that mill/fuel combo.

But hey, maybe you just got a minor air leak, which is actually working in your favour atm. Over time though the engine could start to rev even higher, if so I would start to be worried about leaks. If it remains constant now then there is the chance that you've got it spot on and just routine maintenance is required to keep it going (ARO and cleaning of dirt).

Still enjoy it while it lasts and slap some Jatos.