The lower clamp support on the Hawks is adjustable using an allen wrench. It moves the lower clamp forward or back to almost true vertical stroke. The only true vertical was a design like the Eclipse used.
Go to the Hawk web site ( sorry I can't seem to copy and paste?)
Regarding the clamps. The original clamps that came with my G4 were an assembly of about 7 pieces two halves, two allen screws to hold it together. two internal hardened metal blocks that sandwiched the blade and of course the thumb screw with a nice rubber grip. Obviously an expensive clamp, I had to put helicoils in the assembly because my heavy hands stripped the threads. They were replaced by a simple one block design with a set screw and a thumb screw, this is what they use now. I have never had a problem with blade bending with them. What is nice is there is a hole down the center so no guess work in blade positioning and dept.
I have since modified my upper clamp with the Pozgai (delta clamp) quick clamp ( no longer available thanks to Delta)
Fret work blade clamping is almost instant. I keep several clamps loaded with blades, when one breaks I just pop in another and go.