Ken, I struggle with this myself. What brand and size of blades are you using. I find That smaller size blades will bend more than the larger sizes. Also I find that the Flying Dutchman blades are more resistant to bending than Olsen blades.
Tightening the blade clamp too tight will cause the bending, so ease up on that. To help prevent the blade from slipping in the blade clamp, use some 150 grit sandpaper to clean up the ends of the blades to clean off the oil on the blades. By cleaning the blades, you don't have to tighten the clamp as much.
There are other remedies, but try this first.