One day I am going to open a webshop with sailing parts and setups I can vouch for..

I weight in at 100kgs (220lbs) and know a bit about breakages. On our trapeze setup we progressed from self-tightening setups with uhmw stopper balls, ball bearing blocks and 2-4mm dynema line. Things kept on breaking!
We went through non-ball bearing blocks, heftier stopper balls etc. until we ended up with some pretty hefty steel cheeked blocks. Stitched stopper knots instead of uhmw stopping balls (the uhmw kept on breaking!) etc.

I think trapeze setups see quite high shock loads and unusual directions of load. Keeping it very simple and robust is my philosophy