I don't use the Offshore brand but it's hard to believe they would go under from the pull of a TT30. My Church TX22's stay up and I use TT40's that pull very hard. I would say that as long as your boards stay on top, don't let the fact that they run low in the water bother you because it can be advantageous when detecting when you have a trash fish on. I have learned that when the rear of my board is pulling down, the TT is pulling and when the board is running level, I either have a fish on or the TT has released. In time you can read those things like a book.