yes, I hit a wall regually. it happens in every sport, my dad was a top class runner and would find the same..... As he puts it, you dont improve gradually, you improve in steps. Now you can be on a step for anywhere from a week to years then over night somthing changes and your up another step. I improved in 2004 then went on a step for over a year, not getting many good comp results or anything, but last month I went another step and I am a LOT better than I was last year. Stick with it, you will get better, its a case of when.