The Heavy sniper would be unstoppable. How about no.

No. That would make my scrambler pistol absolutely useless against a Heavy.

https://www.youtube.com/watch?v=umDr0mPuyQc

Nope, 3 reasons, scr pistol, sniper, scr rifle charged shot

You do realize a Scrambler Pistol gets 450% against head shields and 300+ against head armor right?

The heavy suit was designed to be a tank sort of mmo character, yet with the insane damage levels we have make being one more of a burden. They make slow targets with slightly higher hps than assault, and marginal aga other logi. A good fix is to buff hp dramatically, but that does not help much for the heads hot damage. Instead, I believe adding resistances to the suit a better fix. Negate all extra explosive damage so it is down to 100%, as they have maybe a 2-3% chance to get out of the way of them and dusties see a heavy, throw down a hive and spam grenades from cover. Also add in 5-10% damage resistance to small arms as well. This would make them tanky, yet leaves them a weakness (the head shot). In a rpg, the tank has high hp as well as resistaneswhile dealing less damage than others. The less damage here isI the HMG, so leave it as is. Once the different racial suits drop, adjust the resistances per suit to match it's manufacturers preferred stats.

Actually I do use the SP, just because of the headshot damage. Are you saying that a class of suit deserves a specific exemption to a particular weapon or effect? In that case how about I get a Dropship invulnerable to all energy weapons....oh maybe because the Devs tried for BALANCE. Basically to shoot a heavy in the head I have to get extremely close or extremely far away, anything in the middle and I'm hamburger. This probably isn't your intent, but it sounds like you want the single drawback to being a heavy to be run speed.