The idea of increasing damage seems logical, but you need to leave the opportunity to respond to your opponent.
It is enough for a 3 br flamethrower to deal damage from 4 br
4 br should take damage higher by the same amount .
the question is what to do with the flamethrower of the Italian on 2 br. since it is a hybrid and has the strengths and weaknesses of the flamethrowers of both br