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My suggestion isn't a fix so much as a suggestion that your hardware architecture may not be well suited to your application. There is an old joke, a guy meets with his doctor, he says, "doctor it hurts when I go like this" and the guy proceeds to twists is arm halfway around and starts swinging his forearm around violently. The doctor responds, "The solution is simple, don't do that." You're probably better off trying a different way than squeezing your hardware as hard as you can.

I would suggest not pushing your hardware beyond about 80% of its capacity. I would first look at your topics, do you really need all of them? Can things like images have their resolution lowered, preferably in hardware. If you're still stuck perhaps you can split up your bags a bit. You can run rosbag on multiple hosts each with their own physical disks. I would suggest looking at this tutorial on how to accomplish that.