See if you can find a quiet industrial estate with a few roundabouts and have practice at seeing just how well your bike can corner, start off slow and just add a few more mph, my instructor put a lot of effort into cornering and ridding the bike out of the corner to keep it stable, he got me to follow him the first few times and built the speed up, after about the 4th time round the same little route going round quite a large roundabout i had an epiphany, I realized that i hadn't really being paying attention to just how fast or more to the point how far over i was leaning the bike, ohh my i thought, OK it might have included a few more choice words than that. He then got me to do a little slalom type maneuver and managed to get me to do 2 opposite maneuvers at the same time, not describing that very well but it was just to show me how it would feel if you try to confuse the bike, it was like trying to steer against a brick wall, the bike wanted to do what the bike wanted to do. I think where i was going was, professional help is probably going to be the most beneficial for you, as has been said.