Joe,
Oscawana is one of those lakes where you can catch 100 bass in a day, and they are almost all 13". The guys I know who do well there, are the ones who spend their practice and tournament time locating bigger fish (2 - 3lbs). My main suggestion would be to immidiately change you mindset when you get there. Don't go out and expect to catch a lot of fish. Set out to get 5 good bites. I always start by upsizing my bait and moving away from the areas where have have often caught the smaller bass. Spend more time searching the deep water with weeds and rock mix. Almost every big or bigger fish I have caught has come from these types of areas. I'm not saying you won't catch a big fish in other places, but the bigger ones in deep water usually come in numbers.
Kepp a bouy marker handy when you're fishing off shore and kick it over the side the instant you feel a good fish coming to the boat. Than just circle that marker bouy and increase the radious with every pass you make. Remember, that even though a school of bass may number in the hundreds, they sometimes are only keying in on an object of peice of structure that could be the size of your boat or even smaller. Good luck on your next trip and say helo to Perry for me!
BC
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Brendan C.