Originally Posted by Irvin
I have a Gamma starting clamp and one of the old Babolat starting clamps that is supposed to be so great. I will admit my Babolat is much harder to open and it has two spring where the Gamma has three. BUT, the Gamma has never slipped for me. How good is good enough. I will say this though I NEVER pull tension against a clamp with no tension on the other side of the clamp no matter what type clamp I am using.
Maybe the Gamma has improved, but I have a similar experience to OP. I've also had the chance to work with a Gamma Starter in the past year, and it was similar. The Gamma's diamond dusted coating is too smooth, and the plates have a potential for not being aligned correctly/they will eventually fall out.
I'm not positive on your mains starting method, but I use my starter as a backup to the initial pull.