Why not create a ball that like the new custom trail features, you can customize specs by buying points for it.? Like say a ball, with all specs at 0 for 50 credits, then you can add points onto each of the different attributes by buying it at 50 credits per attribute point. So if you want 3 points at balls distance it's 50 credits X 3, 5 points at meter speed = 50 credits X 5 etc.. So depending on how much you willing to spend, you can create the perfect ball for yourself.
So you can create a ball looking like this:
distance - 6.0
spin - 3.0
durability - 4.0
meter speed 6.0
thats 19 points at 950 credits + the 50 credits ball cost, giving you a completely custom ball costing 1000 credits. I know many players who will go absolutely crazy for this, so you will make lots of players very happy to spend more credits than ever before on balls.