At 16, my sorc when using Level 6 spells has +25 with a spell pen VI item (+2 to yer SP).
I thought I was doing ok with this but running Rainbow on hard and I kept being blocked, the one roll I paid attention to
was a 13, so the Orthons in there have a SR of 39+? Seems a tad excessive to me.
Whats your SP and how do you get it to that?