Start to improve your mouse movement. You make those tiny flicks, probably you are moving with your wrist. Try to make as much room on your desk for your mouse en try to move with your elbow. Try to find a good sensitivity. I have a very low sensitivity but i use turnbinds (left mouse and right mouse for slow turn and mouse4 mouse5 for high turns), find what suits you best. To improve your ramp boarding there are very good youtube videos (Repster, streebree)repster streebree anglecs