I find that wen I go down steep technical sections of a trail, my back wheel always comes off the ground. I think it's because I use my front brake more than I should, and my rear tire almost never skids on the ground (It's been drilled into my head that I should never let my tires skid on the trail). I have never flipped forward on my bike while going down these downhill sections before, but if I keep up this riding style sooner or later I will... and it will most definitely be very painful... what should I do to correct this??