ev1lsyk0 mate, understand something here,
fieroid has answered your question in a very subtle manner, unless you are ready to become the mechanic of your bike, understand and learn the way a bike behaves and works before and after big-bores, and unless you are ready to live with 'N' number of break downs/Trouble shooting, and the amount of TIME and MONEY one needs to spend learning, doing trial and error, R&D on the machine is almost equal to Infinity.
the question is if you have the Patience, Dedication, Money, Time and most importantly the Passion to keep you Driven, just stay with the stock bike, if you really want more performance, with out any of this then sell the Unicorn and buy a Karizma.
Edit:or a used comet should do just fine.