If you're worried about the sub not showing up, use a different sub. Try this: start with a saw, put a sharp high pass around 40 Hz, and use a low pass to get it into sub range. Then use a limiter to keep it at a consistent volume. That should work down to about an A (27.5 Hz). It works by cutting out the fundamental, and just playing overtones on the lower notes, so it sounds more like a bass guitar, but deeper, since it gets down into the sub frequencies that acoustic instruments can't reach.
It might not be as heavy, but you won't be stuck in the same key that literally everyone else uses, and your track will stand out.