Shall I nuke the suckers? (Weeds)

I have a weed burner attached to a 15 kilo gas bottle. Works fine on things like grass and annual weeds but not do good on perennials weeds. Spray with vinegar first then when the tops have died off blast them with the flame gun. It only really works if the soil is dry. It still doesn’t kill off the roots but does get all the seedlings.