I'm hyper focused on my mod collection and I can tell you OP that the mod cap doesn't need to be raised at all. You are probably holding onto a ton of "what if" mods. Grey's have got me my best mods so don't just sell them all. But definitely don't go and level every single one up all the way to 12 either cause you'll run out of credits fast this way. I level my Grey's up to 6. If speed or 1 of my required secondaries don't pop up I don't waste the time on the mod, it's trash and sold immediately. Mods are so important in this game that you can not have meta toons and still compete with anyone mods. Good luck and you should be taking in at the very least, 1 +10 speed mod every day if you're doing it right .