I have a bit of good news for you: your spirit doesn't have a 12 dice pool to resist your binding. The spirit's binding resist should only be twice its force, so in your case a 10 dice pool. So you can re-roll those 10 dice or drop the last 2 (whichever the GM is more comfortable with). Also, with Edge you should be able to spend a point to re-roll your misses (in your case it would be 7).