Like Richard suggest, if the E is too quiet, is probably a setup problem. A proper setup by a good tech does wonders to a guitar. I suggest to do that first and see what happens.
Besides that, your guitar will benefit from a pickup upgrade. I suggest the Blackguard 52-set, which has a quite stratty neckpickup. But, I can't even see a set of Country Boys work in mahogany setneck guitar. They will be a more twangy, but aren't shrill at all.