Bishop Steiner, on 27 February 2013 - 12:26 PM, said:
Instead, let's further handicap any mech NOT carrying Streaks, that rely on SRMs as their primary weapon (now a similar damage nerf to Streaks, might actually be a fair balance), and further reduce any use of Commandos, HBK-4SP, Jenners, etc.
Because obviously by using SRMs, they are SO damn OP. I mean I know I sure tremble in my socks at non ECM packing stock COM-2Ds. with their Atlas slaying SRM6 and SRM4.

I haven't seen any arguments that SRM's are extremely OP. Everything I've seen indicates that they're (at most) 20% overpowered. The only reason it's actually noticeable is that people boat them because of that imbalance. When you take that 20% and apply it to an entire mech's arsenal, it becomes obvious that something isn't quite right.
The doubled armor is a non-issue here. The only thing that doubled armor does is dilute the value of high damage single impact weapons like the ac20.