There is no way you should be at 7200rpm just running 116mph with a 4.30 gear.
If you just had a 28" tire at 7200rpm you should be 139mph.
A 29" tire 7200rpm 144mph.
A 30" tire 7200rpm 149mph.
In order to get all the et you can I'd run a 4.88 gear and a 30" to a 32" tire.