Line breaking at the knot

[Fishnngolfn]

I am using 20# orange Suffix braid tied (J-knot) to a 4' to 5' 12# Berkley Vanish fluoro leader (can't find the P-line leader line in stores). I am tying the fluoro leader to the 3/0 exg gammy hook using a reverse cinch knot. I caught 4 (1 - 1.5lb) bass before the next hook set broke at the knot where I tie the fluoro onto the hook. I am having to pull each one of these guys threw some heavy weeds after I hook them. They arrive at the bank with about 1 pound of weeds. I retied a new hook and caught 2 more fish and then lost another one due to line breaking at the knot. I will say that the knot broke once while retying the new hook. It broke when cinching the knot. Why is the knot at the hook breaking? I have used the reverse cinch knot many times with mono and never had it break. Is it breaking because the knot is weakened from the fish hitting the lure? All of the hits were very large topwater hits or hits when the lure hit the water. I know everyone's view on vanish but I have not had it break as a leader. It is just breaking at the knot but only after I catch several fish.

Here is the reverse cinch knot that I am tying - Reverse cinch or half blood knot