Currently the necromancer UC companion buffs you in all targeted buffs ie. Prot, EW, Bless. I have 0 skill in SC so im unsure of its capabilities.
Instead of all 3 spell skills being superseded by the UC while ranking up my suggestion is to remove one of the three, preferably bless, so the min/max strat of neglecting those spells in favor of allowing the companion to wholly be the buffer is no longer viable. This should slightly decrease the ease of necromancer leveling while maintaining the top end performance of the class.