What's your kick mic of choice now, Alex?
The EV664 is a sleeper, IMO...Here's a typical one on ebay--you see them all the time...
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1317888789
They remind me sonically of their cousin,
the 666, which commonly goes for 200-250.00, and is one of my favs on kick. Everyone should have a 664 around (make sure U get the cable with the mic--it's not an XLR and is rather hard to replace)...like I said, they are very common, indestructable, and cheap...
OK, if it's an overdub, and you have 2 channels to burn, I'd mic the top with the SM57, the bottom with your kick mic (or a 58 in a pinch), and put that 603 out front, and blend the 3 channels to 2. It would sure be nice to be able to mix them to 2 tracks later to get the blend right in the track. Like I said, some compression over the whole mix will help blend the tracks...
Personally, I would work in mono, not only during tracking (helps to prevent phasing problems), but mixdown (I'd mix the 3 mics to 1 track). My experience is that you will want to control the djemble rather than have it get spread out over your mix...it really is an obtrusive instrument sonically...
Miking a single djembe is kinda like miking a trap set, really...it's got all the same freq's except for the metal, but even then, there's a lot of high's coming off that top skin...
LOL!
Bruce
www.bruceharvie.com