My Port a tree is about 25 years old. Before race season I’ll use it daily. I’ve found it really helps in tightening up the grouping. My racing is all foot brake. Though I made a foot pedal years ago I use the hand button. Practice both full and pro tree. Use the same rollout. This will allow you to see if you are anticipating the light. Pro will always be slightly slower, about .01. This has allowed me to maintain a .025-.030 average light over the last 5 years. It has greatly reduced the number of lights beyond .04x. I consider a high .03x light to be late now.
Doug