[Do you usually use simple figure eight knots? I have had difficulty making knots hold with weedeater line in the past. The plastic cord is very stiff and the poly is slick. ]

Yes, figure eight knots are what I use. Don't use any line heavier than .080", and .065" is even better.

"Forget pounds and ounces, I'm figuring displacement!"

If we accept that: MBG(+)FGSF(=)HBG(F1)
And we surmise that: BG(>)HBG(F1) while GSF(<)HBG(F1)
Would it hold true that: HBG(F1)(+)AM500(x)q.d.(=)1.5lbGRWT?
PB answer: It depends.