Any more than 5 QP's in a balanced Snovabow like this is usually pointless. Too much quanta is making the deck worse, not better.
As this is based on Bone Wall, the CC is very good. Mutation seems out of place though as there are no good targets for it. However, Maxell's Demon is a perfect fit when combined with other CC. So, I would do -2 Mutation, +1 Demon, +1 QP.
However, this isn't in Deck Help. With that in mind, what do you use it for? Have you tried using Pulverizers over Steals? They're perfect against Bronze, for instance. Without Pulvies I'd do -1 SoSe and +1 Graboid.