Get thicker strings... I suggest GHS Boomers, or GHS Zakk Wylde Boomers. The ZW Boomers are what I use on all my guitars. They're great for everything, even standard tuning. I would suggest taking it to a tech and buying a set or two of the strings that you want and telling them exactly what you want. Tell them what your problem is and they'll sett your guitar up to work well with the strings you choose. Ideally you want a guitar set up that will have enough enough action to allow you to play low tunings without fret buzz... then allow you to tune to a normal tuning and play with good playablity... Good luck