Every knot I use with fluorocarbon line when I cinch down it heats up and curls, it becomes unusable.

I use plenty of spit, I have even sprayed it with kvd line conditioner, same thing happens.

is it possible that the line I am using is no good? I am using p-line brand.

are you tightening the knot too quickly? no matter how good you moist it, if you tighten it too quick, it can still get damaged.

If not, then its probably the line.

San Diego jam?  I pull it tight with my tongue on the line/knot.