I am getting really annoyed with alignment. I have a Beseler 45 VXL enlarger. I verified that the lens stage, negative stage and baseboard are in alignment. As I drilled down through possibilities, I figured out that my easel is bowed. In fact, they all are. I have 3 Saunders Pro 4 blade easels:11x14, 16x20, and 20x24. All of them are convex on the surface with the center of the easel slightly closer to the lens than the corners of the easel.

For 8x10 and 11x14 prints the problem is small. But for 16x20 the problem is unacceptable. I'm not sure what to do about it. I do have a vacuum easel that I have never used. I pulled that out but it has 4 leveling feet which I can never seem to get right but the center of it (steel plate) seems slightly bowed as well. Is it just me? Any advice is appreciated.