Lowering it even an inch will affect it's handling, I wouldn't do it unless it's absolutely necessary.
I can't imagine a liter bike, my Ninja ZX-6R is a handful in any gear under 4th, and it still likes to wave that front wheel in the air sometimes when I don't outright ask it to
P.S. get a slip-on exhaust or a full system if you have the money, you won't regret it. They sound good stock but when people can hear that scream of a sportbike from a mile away (and they're not too loud going through towns at tame RPMs) you'll always have a smile on your face.
Also
Nice fucking bike =)