ofcourse suspension shop will say you need a Ohlins 30mm and a TTX setup.
1) set your front/rear sag.
2) ride for a week, see how it feels. if the front is too soft, get it re-sprung.
loose OEM exhaust and heavy battery to make the bike handle and turn better.
sorry, it will be never be a R6, no matter what you do (that thing is a weapon on the track)
"sent while drinking tea..."
05 - cbr600rr
06 - s3