Would like to reduce throttle response  ,Will a slow action throttle help a bit , just a too much gas and it's away ,need more slow  throttle control , another question when bleeding the clutch , fluid is moving back and forwards in the tube , ? Not flowing out . Master cylinder when lever is quick  pinched it spits out the master cylinderis this normal? Hope you can help as just learning the mechanics of a motorcycle .

make sure the clutch has free play on the lever..ideally no more than about 2-3mm measured at the tip of the lever

 The best way to slow down a 300 is to drop the counter shaft sprocket down one size. And remember the clutch slows it down better than the throttle.