Well, it all balanced when I wrote it up, so I'll have to think about this a bit. I doubt I'd just miss five points of qualities, but then again it appears I'm in good company in that regard!
If it makes you feel any better, I also noticed a miscalculation with my own familiar build that I had to correct.
Where are your custom spells described in detail?
BTW, how did Haestus manage that. Neither his skill nor his Finesse seem all that high.