1. spec , get the spirit talent (ups crit) in arcane, remove pts in arcane stability to compensate and 1 pt in magic attunement.
2. Youre right bout insane over hit cap - get to 8% for arcane ( with spriest / boomkin in raid) or 11% without it. Use a hit trinket to compensate.
3. As soon as you get the badges ( in your case) get the T10 robes and make yourself the
http://www.wowwiki.com/Leggings_of_Woven_Death which are best in slot for mages.
4. After a few upgrades get your haste to about 900-1k haste which with bloodlust and icy veins puts ABlast at 1 second ( capped). Remember to leave some room for your latency.