In situations like this: I've remedied it by doing a couple of different things. First, be sure to have nice sharp carbide toothed dado blade. Second, clamp a piece of wood to the saw table, on the opposite side of the blade, leaving just enough space for the work piece to be fed through the gap - in other words a guide strip. Or you could try cutting the frame rest rabbet in the other orientation, with the board flat on the saw table as it's fed through the blade.When I try to use the Dato blade on my table-saw, The wood bounces and is very hard to hold straight. I can only cut the rabbets for the frame ledge by going in very small increments and making multiple cuts. Is there a trick?