Thank you so much everyone for your input. At the moment I am limited to 8x10 and happy so far with the contact frame I have. Looking to go bigger especially with some pan shots and will be dipping my toes in digital negs soon. It seems there are some who get good prints with bigger contact frames and others that don't. I think I will try Dennis solution with clamps first while keeping my eye out of a vacuum frame.
Again the input has been invaluable, thank you again