I spent a lot of time clamping down projects and it finally evolved to this. I not saying it is my final answer but this works. The red rail almost never moves. The natural colored block is my back block. I stick my piece of wood it and slide the two blue blocks to hold the piece rock steady. I have run several pieces and it hasn’t failed yet. The sliding blocks are held by ratcheting bolts that I bought on EBAY.
I have included a picture of the lip that can be used for warped boards. I will draw a diagram of this and let the forum try it they want to.