Lex, if this iOS on your plasma with the Proma, please try and fix one issue at a time - its called Thrashing - running around trying to fix multiple issues at once and it makes offering advice very difficult.
Get the Proma / THC going first I think, slowing in corners is 100% normal, any circles less that about 1-1/4" you need to add a slow-down rule anyway in sheet cam or they do not cut very well, smaller than say 1" is about 50% slower than the straight speed.