psu_fish
I would try to launch of out the Millcreek Launch. I don't care for Toby launch. It is too steep and too tight of turnaround.
I live about 10-15 mins from Clarion, I only use Piney Dam in the spring to blow the winter storage cobwebs out of my outboard, with couple passes up and back from Millcreek.
Musky guys troll Piney, no idea on how well they do. Some guys will fish the upper end past Millcreek where the slack water turns back into the natural river, mainly for smallmouths and maybe some walleyes.
I'm sure if you ease into the feeder creeks, might find some panfish, but to me, Piney in general is not very "fishy". Great for tubing and skiing.
Your experience is what most would give. But, stands to reason with as plentiful as the fish are in the Clarion River, that Piney has to hold some untapped opportunity. Much like Tionesta Lake, I think that the recreational ski/tube traffic in the summer makes it less fishable . . . the depth and steep drop-offs make finding fish holding spots challenging, and catching even more challenging. BUT, the fish HAVE to be there, because they are in the River. It's finding them, putting the right presentation on them, and getting them to bite.
FWIW, now that it's November and water temps backing through the 50s into the 40s, a 'blown out' Allegheny can be VERY productive for Walleye in eddys slack water, even when it appears 'too muddy' to fish for many. Go bigger . . . darker (black/brown/olive will out produce chartreuse and pink in muddy water) . . . or smelly (LOVE a 3/8 oz black jig tipped w a 3" Gulp shiner and a stinger hook). Also, seek out 'color lines' at mouths of streams (the mouth of Pithole Ck at Henry's Bend between Tionesta and Oil City is an underappreciated Walleye spot) . . . they will lay on those lines waiting for baitfish.
Good luck! Let us know how Piney fishes!!