40 more than 120 is 50%? They are really -blam!-ing up in middle/high school these days. You waste both subclass perks and get 40 more damage. Quick draw, gunslingers trance, embrace the void, shadestep, hungering blade and a ton Of other complimentary subclass perks giving the other classes and subclass plenty of advantages over the slow as shit sun singers that only has grenades and an overhyped melee. Against any competent team, sunsingers get domed as soon as they pop their super 90% of the time, which nobody ever seems to want to talk about. Thanks for the good laugh with the math though.

You listed a bunch of perks but none of them are related to grenades. For a class to be OP it does not matter how many nodes they need to use, you could use the entire skill tree for all I care...that grenade and flame shield are OP as -blam!-. 1 v 1 in medium/close range sunsinger wins because the range of the melee is sniper class while the damage is shotgun class and on top of that you even get a shield.