I'm 6'2", 180 lbs. I have some time on a CBR250 and Ninja 300. I liked the CBR250 better. The Ninja might make a few more HP, but the CBR actually makes a ft-lb or two more due to it being a longer stroke single vs a twin cylinder. It was easier to ride in traffic and modulate the clutch than...
I ran Rotella conventional 10w30 over the winter in my new Honda NC700X with no trouble. Seemed to perform the same as Honda's GN4 10w40. I'll switch to T6 5w40 at my next change. I've ran it in a lot of wet clutch bikes and really like it.