I will give a +1 to the thought of some rebalancing to the Demolisher at least (I do not have enough experience with/against Morrigu to comment on it).
The Demolisher prime was perfect in 0.3 I think. I still wanted to smash something when I got a more expensive mech shot out by it but calming down I could see how it needed to have about that level of power for the balance to work. It is now very much cheaper (I use "very" since one have to also take into account price increases across the board while the Demo got a reduction). The Demo Prime was one of the few tanks that saw any amount of use in scrims and league games in 0.3 and it is I think if anything a testament to that it had a very proper place in the game hierarchy in 0.3.
I see arguments that the Atlas has more armour. Well, what matters is how much it takes to take it out. Invictus (forgive me for not using your amount of caps and foregoing the added x-es) already touched on that subject by comparing turret with CT. It is true that the turret can be hit from all angles, but it can also return fire in all angles. The Atlas needs to face its opponent to fire. The Atlas is also slow and cumbersome like the tanks (Slower, but handles terrain better)!. Tanks also have a very low profile which I find very useful.
Also, the argument that lights can beat them? Hmmn. I find that a bit hard to swallow as well. Outrun the turret twist? Maybe for a short bit, but if all else tails, tanker swivels turret the other way around. Ther is not enough time for a light mech to turn around and keep outside the arc. Hit and run, outrange or overwhelm are is options one have.
The good thing with this reallocation of armour to further increase the turret is that it might actually make it worth shooting another component. That would be nice. The only other area that could potentially be worth shooting in 0.3 was the rear armour and only if the tank driver was caught too far from cover since it could otherwise just reverse into a wall negating the shots you had placed in its rear. So in summary I simply think the value of the Demo Prime is not matched by its price (it is too cheap).
/Merf - Thinks with all the talk of tanks being supposed to have this or that role, it would be beneficial to know what role the devs intended the different tanks to have.