If its on track, then get it dynoed and see where your peak power is.
Cant remember if myt J has a limiter. My K does.
As for past 130mph, why not? depends on how much you want to spend.
When riding on track, you get used to engine pitch and where to change. I can move my power on mine with some gadget as it was too low. Mine is tunes for mid range but will pull without slipstreaming side by side with an early CBR600. It gets beat on initial accelleration but from 80mphish, you cant split them even when both are hitting the limiter. It K has been very de-restricted

I have a gold label CDi fitted, which I believe is standard(unmodded), and as far as I can ascertain, there is a limiter when accelerating as I sometimes find that it hits this when I get carried away chasing bigger bikes at about 15k on the rev counter. Mine is a K model, but could be a bitza!
However when it was checked on the Dyno, the rev counter over read by about 500 rpm at the top end. IE Indicated 14,500 on the bike was 14,000 on the dyno.