You should definitely get the suspension tuned for your weight, it will make a noticeable difference. I also agree on the front master cylinder (OEM is Nissin) that it leaves a lot to be desired. Admittedly this is one part I still have on my bike, but with summer coming and me taking a break for a few months, I'll also be replacing it with the RCS19.
Mine is the 800 so I can't really comment on the performance you are noticing, but I do know that once I got mine to the track I was impressed at how nimble this bike is, even in stock config. I hope you will be too.
2015 F3 800