A few things i have noticed in my last few times of messing around. ( Lvl 50 caster )
Body of the sun/Lesser aura of cold, when maximised or empowered they only last 50 sec's per cast, extended 1min 40 secs. Description says 1 rd/cl but Persistent works.
Splinterbolt - only get 6 bolts. according to description 1 @3 + every 6 lvls, so @ 3, 9,15,21,27,33,39,45? 8 bolts?
Storm of vengeance lasts 2 1/2 minutes still.
Stonehold does absolutely nothing on a failed save on Thumper in arena, can you check this one please!