l use Airflo Sightfree 8lb for near enough everything, l bought a reel of 7lb FullingMill Co-Polymer and used it for first time today at Loch Insch, first fish and the dropper came off, immediately went back to Sightfree and no probs rest of day.
The knot l used has been same knot for 36 years, basically an overhand, passed through twice, moistened and pulled tight, should l have maybe used something different for Co-polymer