Hi all! I'm new, so forgive me if I made some mistake

I'm a magsorc highelf with 610cp, but I think my stats are really low!
My set is:
5 yellow necromance
infallible eather yellow jewelry (I have elegant and willpower too)
head and shoulders of maw of infernal (yellow only the head heavy. I have light shoulders so I'm waiting).
1 lightning yellow staff of the torug
1 lightning yellow staff of infallible eather
So, I have 42k magicka, 2100 spell damage, but 42% of critical. So, sometimes my shooting star take 30k damage.
I don't know why I'm so low on damage

Thanks for help