I have tried slight adjustments to the cutter height. Since making the 6 bolt compound clamp, only 12L14 still gives me grief. Every other material parts beautifully. It's weird. I think it has to just be the nature of 12L14. It is a pretty "soft" metal to machine.
I enjoyed the posts about the abuse of classic old machines by those who know not what they do. Sad, but entertaining.