Frost specc, while it has aswome and fun mechanics, has some numerical disbalances.
First of all Ice Barrier which used to be feared in WotLK and TBC is now utter crap and most of time is not even worth the cast besides maybe to lure healer to waste mana on dispelling it.
The second problem is ice lance vs frostbolt damage, frostbolt feels kinda weak now while ice lance seems to be overpowered. Now if they simply buffed frostbolt or nerfed ice lance it would be back to boring days of frostbolt spam in pve so i think this would be a nice fix.
1. - nerf ice lance dmaamge by 20%
2.- buff frostbolt damage by 20%
3.- change fingers of frost, now in addition to its old effect it increases the damage of ice lance by 35%
So what does this mean? Well gone are the days of spaming ice lance into frozen and deep frozen stuff since frostbolt will be doing wayy bigger damage. So you will want to cast frostbolt whenever possible for shatter. On the other hand whenever you get a fingers of frost proc you will be wanting to use ice lance since it will out damage frostbolt and is instant cast.
Not quite sure about the exact numbers but idea is if target isnt frozen or is frozen but no FoF you use Frostbolt, if you have Fingers of Frost or you have to move you use ice lance.