Thanks, angular motion with lower revs does help a bit. Just sticking with the Storm/Roto Grip family this is what I got:
The Show Off coming out in a bit over a month might fit the bill. Not 100% sure on the reaction being angular, but Luke Rosdahl made a good argument for it being so in another thread.
The Wreck-Em would definitely do it from the motion standpoint but I'm not sure just how much stronger it would be than the Match Pearl. Stronger, but enough to justify the purchase? Hmm...
The Dare Devil is a pretty safe bet. It's not super angular, but enough so to consider it. If you he wants to go all the way to the top of the spectrum then the No Rules Pearl also fits.
There's the Hy-Road and Hy-Road Pearl but I'm not sure either are either angular enough of a motion or enough of a step up to make sense.
The Timeless might be okay, but that's been hit-or-miss for a lot of people with varying styles. I've generally seen it be better for those with higher revs so I wouldn't feel great recommending it in this situation, but it's an option.
I think the Code Black would be really good here. Stronger and earlier with that core, but still has a lot of pop off the spot and with R2S pearl. Not overly strong for a Big Ben house shot though which is good. Possibly the Code Red too, I've heard some say that might actually be more off the spot than the Code Black but like the Show Off I would wait and see it in action locally first.