Good morning. I have a question about hitch cords. I've been climbing on 1/2 inch blue streak rope and using beeline and armour prus 8mm hitch cord with a hitch climber pulley. All of them are pretty well broke in but my hitch grabs really tight,sometimes I have to go up to get it to release. My friend had the same setup but no issues. He was also about 60 pounds lighter than me. I'm 6'2 and 210 pounds. I was wondering if a 10mm cord would be a better choice for me. Or maybe a different brand of 8mm. I'm trying to research it before spending the money and figured this is the best place to start. Oh and are the in between sizes like 9.3 worth trying? Thanks