You seem to have 2 problems here.
1. The Yellow Misfit is for very light oil and the Primal Rage is for medium to medium-heavy oil. You could fit at least 2 balls between those two to make an arsenal.
2. I'm not sure if any surface treatment will allow the Primal to be one step up from the Yellow Misfit.
As for area, I suspect the Yellow is too weak to allow you inside pull area, while it may give you swing area (if you miss to the outside). On the other hand the Primal would probably handle inside pull area, but is more than likely too strong for the amount of dry you are seeing on the outside.
If you don't want to buy another new or used ball, you could try a high gloss polish on the Primal after sanding it very fine (4000 grit) or you could try hazing the Yellow Misfit lightly with a 4000 grit damp pad by hand to allow it to better handle the inside oil. It is a mild enough ball that you should, theoretically still get plenty of length with it hazed (just enough to remove most of the shine; don't sand it fully to 4000 grit until the hazing doesn't seem to be enough surface.).
I'd suggest playing with the surface of the Misfit, as that will be more easily restored to the stock surface than the Motiv, which is trickier to get back to stock.
This process of adjusting the surface is one of finesse and trial and error. You're the best one to determine how far to go, by watching the ball reaction and tracking what changes you made. ALso don't forget NOT to jump to conclusions, as there are lots of variables, more so during the summer: like the way the lanes are oiled, the humidity and A/C, and just the way you feel while bowling can all change the ball's reaction. The summer is usually more subject to changes like these than during the winter. At least II have found that to be true.
