1. hit, cap is 289 so there is room of 61 points to swap some items round if desired.
2. 4 pieces T10 in place, nice.
3. gemming and enchants, you can loose the 12hit/12crit enchant on youre boots and might consider gemming youre pants and boots so you can get the +7 SP bonus from those items. Ignoring bonusses of +5 and less is good, +7 is a nice bonus to get. I know you want the haste to balance crit and haste out. but....
4. since youre 61 points over the hitcap you can swap out the wand of ruby claret (33 hit) and get a better one. See
http://www.shadowpriest.com/viewtopic.php?f=62&t=24134 for places to get an upgrade for that wand.