Yes, almost all tournament rulesets have had no banning on these controllers. You should always check with your TO to find out if they allow these. Most major US tournaments allow these. They do ban macros and other lighting mods that might interfear with your controller's motherboard but we don't offer those kind of mods!
We don't use any kind of machine to do these mods. We use Lasers to mark off the spots and then we sand the controllers down by hand in the U.S.A for perfect precision.
It means just as it's read. Lessen Trigger Strain is a mod we do to make the shoulder buttons more smooth when pressed. This allows for faster inputs and less force needed to push down using your fingers.
We had 3 but are now down to just Mike. We are always open to extra help! We are also open to partnerships!