I was using the incredibleTackle Crimps with their FluoroCarbon and never had an issue but I have heard about lots of issues with several people having lots of different brands crimps slipping etc. I suppose it's a very delicate process with every person applying different amounts of pressure on the pliers. Since the ready made booms became available, to be honest I swapped over to these for my Ronnie's as just found them trouble free, but its all about confidence isn't it.
https://incrediblegroup.co.uk/shop/terminal-tackle/hooklink-materials/fluorocarbon-ready-made-booms/