You need high tension on the blade. You want to hear a high "plng" when you pluck the blade. You need to slow down your feed rate. Let the blade do the cutting, and you need to learn to not apply lateral pressure to the blade when cutting curves.
The Olsen PGT blades are ok for cutting gentle curves, but not for tight curves, especially in hardwoods. I use Flying Dutchman Ultra Reverse Blades for hardwoods. For 3/4" puzzles in hardwoods, I would use a #5.
Welcome to the Village and visit often!
P.S. Great job on your puzzles!