Im trying to test out for any tripping on the THC Min and Max for my Mach 3 Plasma, but it still seems to go over the limit when i jog up and down my z axis.
I've done everything possible to try to make it reach its limit, but its not working.
Any suggestions?

That's because the THC min and max settings under THC, control limits of the Z ( to prevent a tip crash if the cut hits a hole or runs off the edge for example) When jogging the Z is just a normal axis and the THC parameters do not apply.