I'm glad you have made the decision yourself, it is one that I would not like to have to make. I do think that the riding your more likely to be doing means the ZRX would be a winner.
If you REALLY have to upgrade, why not do the logical thing and get a ZRX12. By doing the cams and other ZZR mods to your 11 in search of HP you make take away the bottom end to some degree, great if your doing drag runs and bouncing it off the limiter round a track

Its not all about how much you've got - take Tim for example, the less he's got the faster he goes
I do love my nine - but to be honest mine is a little removed from a stocker and that is one of the reasons why it is just so farking good. Then again my ZRX is not stock either and I love it as well. As I said - a decision I would not want to have to make.
Tell you what, I know how to get you sorted - see you Sunday morning & i'll fill you in
