Our club has a new five stand range with Laporte 12 column carousel machines. The machines came new with grey release springs. On the Laporte web site there it mentions a green spring. I can’t see where it indicates which of the grey or green springs is more powerful. We’d like to slow the targets down on one of the machines and have run the adjustment of the grey spring out to its limit. Has anyone had enough experience with either springs to know which is more powerful?