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We considered the notion of doing a max heat threshold reduction but this would have ended up nerfing every weapon system and every Mech in the game. This is why the heat scale penalty path was chosen since it lets us address every weapon individually and also allows us to take into consideration all Mech builds.
It took a bit for this moment of clarity (I blame the complex heat scaling proposal mental processing time), although you already have this mechanic with the weapon heat generation values. Raising a weapon's heat scale will balance it out exactly the same way without all the overly complex heat scaling per variant rules. Taking a look from just the PPC/ER PPC perspective:
-A light mech can generally mount one PPC. This is balanced in the fact that the light mech is a one trick pony that will run very hot in short range combat. You might get one or two shots before you have to either back off or risk a shut down if you continue to push with a third shot. Same general damage they would do with a few medium or small lasers, probably less over a longer period of time.
-Assault mechs could do 1 or 2 PPCs and still mix in other weapons with good heat management skills. 3 if they were completely devoted to having heat sinks to backstop the heat generation, although you might still hit 75% to 80% heat with firing all three so it's going to run pretty hot. This is a common comment regarding the 3 PPC Awesome, btw, it runs very hot. At 4 PPCs you would generate enough heat that you just shut down from the huge heat spike after one alpha.
Alpha strikes become a desperation or finishing move as intended, not a primary method of fire.
Right now my 4 ER PPC hits about 45-50% heat after a full alpha strike. These changes might bump me up to 60% or so which I can completely avoid if I stagger my shots .5 seconds apart. Even if I fire three alphas in a row, I still won't hit 150% to even take damage unless I don't stagger my shots.
It isn't the mech variant that is the problem, it's the weapons themselves. Tune the weapon heat higher so there isn't such a clear min/max frontrunner in the PPC and Gauss Rifle setup by upping the heat. It's worth a try, and it's a lot less coding and troubleshooting than this new heat system.