Tim, my wife has a cottage in hector and there are a lot of good spots around there. Fish the points, in my experiences i have had the best luck on the west side of the lake across from Hector trolling North.
I am not a pro, i do my best and i have had amazing days on Seneca. But... it has been an extreme challenge as of late. For example we caught 19 fish in 6 hours the day before the derby last year... then caught four fish the whole derby.
Good luck!