I've been using 1.15 Hyper G and Cyclone for about the last year. I find that after 4 hours or so in a 16x19 frame I start to get notching on main strings and on the crosses also after about 6. My question is, once the string is notched should you go ahead and cut out the set? I typically cut at 6-7 hours but am considering cutting at 4 once the mains start to notch. I assume the thinner the string the faster it notches so I am try and go to a 17 gauge instead although I'm a non-string breaker and love the extra spin and feel from the 1.15.