Didn't read it all but I yeah your wrong on a few parts. In Hyjal/BT/Sunwell gear spell hit until capped > spell haste > spell damage > spell crit. 2/48/11 is better than 10/48/3 in all situations. When your guild is deep into sunwell 0/40/21 is also viable for cold snap, which lets you have two icy veins and two ice blocks. Also when your gear gets to a certain point (don't remember the exact number on the stats) but you shouldn't be fireblasting at all unless you are running to a different position on a phase change or you are running away from fire etc. Your rotation should be Scorch, Scorch, Scorch, Scorch, Scorch, Fireball x8 (or x9, or even 10), Scorch, Fireball x8, Scorch and so on... And yeah I recommend the addon Scorchio which lets you know how long until the scorch debuff runs out, if you have other mages scorching in the raid the timer will reset back to 30. Scorching when not necessary or too early reduces your dps. And yeah arcane is only good in t5'ish content with the 2pc t5 bonus, otherwise fire is superior.
Lots of fail in this thread