Sounds like you aren't cinching the knot down tight enough. Make sure the braid is biting all the way down to the front of the knot. The knot tightens from the back to the front, so if you aren't "completing" the cinch then it will come undone.The first several wraps have tendency to get loose as they constantly hit the guides. I thought that doing some half hitches in the beginning of the FG knot could help.
Heavier line also needs fewer wraps to help get even tension and bite into the mono/fluoro.In heavier line you really can't cinch the initial/bottom wraps fully tight by pulling after the braiding is completed; you have to maintain tension while braiding, and the heavier the line the more tension you need. Apply more tension while forming the wraps and cinch when complete as above. Putting half hitches on the bottom impedes the FG from even forming and makes the whole knot irrelevant/trash.
Heavier line also needs fewer wraps to help get even tension and bite into the mono/fluoro.
Yes, this almost exactly except I don't use the glue. Also don't go nuts trying to cinch the knot with your line pullers (too much and you just stretch and weaken the line), just enough to get an even tension on the wraps. The only way is to practice and practice...20 wraps for below 60# and 16 wraps for heavier than 60. Do a search in this forum there are some excellent threads about the best way to tie a FG. The general consensus is only one snug half hitch to lock the wraps in (snug, not too tight as it causes failure by cutting in to the knot) and then finish with a Rizzuto. Clip the mono/fluoro tag close so that it doesn't hang up in the guides. Then a little dab of glue on the Rizzuto only.
See above as a guide, you may need to alter the number of wraps to suite your application. You need to practice with "your line and leaders". There is no magic number of wraps, just practice and more practice. It helps if you understand what you are doing to the line and how the knot holds...For the heavier combos.....could you give us an example of # wraps vs line test?
I still did 20 wraps for the 80 braid / 60 mono combo.
What about 100 braid / 80 (or 100) mono & fluoro? At that point are you doing say 18 wraps? 16?
How about even heavier.....130 braid to 120/130 mono & fluoro?
A real-world test: On recent trip, I was long-soaking a bait. 50 lb braid, FG knot to 35 lb Sunline fluoro. Got picked up by a big fish, couldn't stop it. 10 wraps left on spool I broke it off. The FG held, and the fluoro broke at the hook, SD knot.Pics would help. Every time I've tried breaking an FG knot the braid breaks away from the knot.