My pond's snails get eaten by my yellow perch YP, and by my rainbow trout. I don't have any RES, have few snails, and have not seen a grub in any of my fish, LMB, YP, GSF, HBG, BG, trout, BCP, in the 15 years I've been eating them.
The very large gape of tiger trout TT and their brown trout/brook trout parentage lends me to think that this hybrid species will consume many sunfish. A possible added bonus is the TT are not reproducing predators, so you can easily control their numbers. They are beautiful fish, much more so than internet photos can show. If you can source TT. I'd highly recommend your trying some of them. My 20+ inch TT will thrash and swallow filleted carcasses of any sized GSF and BG right off the dock. That's a thrilling sight.
That you have 9" PS for the table seems to me that things are going well at this point. I'd like to have any sized PS!
Id love to try the TT but I cant get them here! Unfortunately the construction of ponds, lakes and wetlands is not that popular in Ontario. The 9 inchers and bigger are pretty much record sized PS in this area - they are monsters.
