My fav ball for snap on the back end and easy through the heads is the jigsaw.
I always use viz a balls for spares, they are plastic and rarely move.
My old track 2 heat also gets throught the mids and has a good snap.
I've found that shinny balls that you build up rotation enegry snap well on the back end, you just have to gage your speed and rotation>
Good luck and welcome to the boards Tony...........
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