hi, if things still aren't working then my advice would be to download another keyboard off the android market
i suggest GOkeyboard - i downloaded it t'other day and it works brilliantly, i'm so happy with it. it's got several very handy shortcuts and doesn't hang at all when i type quickly, whereas the original HTC keyboard tended to hang with quick typing and the t9 would stop working, leaving me with a load of gobbledegook which i had to keep correcting.
so yeah, it's probs the software in your current keyboard not being quick enough for your typing, so GOkeyboard is defo the way to go in my eyes; great keyboard!