I have some experience with a few of these balls. The grudge is probably a little stronger than you think already. One of the bigger snow tires produced (needs lots of oil) I've never seen a Aura mystic roll so no comments there, The exile is weak I have a few friends who rolled it it's the weakest of your new ones it does hit well just never moves like you'd think, the gold rhino can be a good ball if your like most I've seen use it oob is an over/under nightmare add a little surface you'll like it probably should be at about 3k. Just looking at the numbers the Grudge should be earlier than the Mystic but if it's an issue the current surface on they Grudge hybrid is 500/4000 you might change that to 500/3000 or 500/2000 would be my suggestion. Good Luck bud
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