Tuning my Bass Drum has always been a concept I've been scared of. Any tips or advice, or references?
Aha, Bob Gatzen! I love his videos, (VERY interesting and informative!) but I dislike his bass drum sound.
The vids are designed to show you the tuning process. The rest is up to you. If you don't like the sound at least you now know how to tune in order to come up with something you do like.
My bass drum has absolutely no muffling
Try putting something really light and small in there against the batter head. You'll get a bit more attack if you dampen the batter slightly and might help it cut with perceived volume. Especially when playing at faster speeds no dampening IMO makes the drum sound a bit woolly and undefined. This is from a death metal perspective though so add your own prejudices to that.