If I could, I would try soft break in 9b league for sure.
But it's technically against the rules.
In the past I'd had it in my head that without a magic rack, soft break was pretty low success rate.
Like gaps I couldn't see were keeping it down to maybe 50% success rate.
But it appears with a good condition diamond, delta rack, and (presumably) good condition aramiths...
plus two motivated players who take the time to rack carefully and break correctly...
The success rate should be more like 80-90%.
The times the players failed, Joe Tucker was able to spot the problem right away... they missed a gap
(which you know by the 9ball moving) or they cut the wrong side of the head ball
(the cue ball should only cut towards the breaker's side, never the opposite side).
I believe this confirms that the magic rack doesn't do anything special that you can't do with a normal rack...
It's a myth that the wing ball gets more wired than usual or that the rack allows for lower speeds than
you normally could do. Corey's speed was so soft it almost looked like it wouldn't make for a good lag
I'm also surprised at the 50% runout rate. Most players would be thrilled with that.
But I think Corey stubbornly refused to change a break that wasn't working for him (he made a ball
but had an unmakeable 3-ball almost every time) and Shane kept breaking harder than necessary,
leaving the cue ball stuck on the rail, or too far from the 1, or getting hooked on the 1.
If you figure out the issue with corey's 3-ball, or modify shane's so he ends up as easy on the 1 as corey,
I think 70%+ is not impossible for these guys.