When I create a cut layer, I set my min and my max to the same %.
On my machine if I’m cutting say 3mm ply I set my min to 100% and my max to 100%. 100% on my machine is still in the safe ma range for my tube.
Your % will vary based on ma.
25 ma is high for a 60 watt tube. It should only be around 16 to 18 ma. 25 ma will quickly burn the tube out.