I've run JM27's as OH's before. They work best if you have darker cymbals that you want to brighten up a bit; otherwise the top end is a little overkill.
Keep in mind your OH's are not only capturing the cymbals, but an overall stereo image of the kit (Ive actually had great results without mics on the toms; OH's can capture them well if positioned correctly). Use the best pair of stereo mics you have, or invest most of your money in the best pair you can afford. They're the most important mics on your kit, IMO.
The JM27's sound a bit murky to me, that's why I didn't use them for stereo field recording. I got them for next to nothing so I wasn't worried about leaving them with the club but they haven't used them at all in at least two years so I got them back. They may come in handy one day. I was going to put up my ADK A6 mics as overheads last night but couldn't get the clips I had up for pencil mics to come loose. I would have had to run for a couple of pairs of pliers and just didn't have time. I ended up using them at the stage lip though and they sounded great there!
Our stage is small so the drum overheads can sometimes pick up other things. If the drummer is light on the cymbals there might end up being enough gain to hear the room which I don't like. The overheads are not on stands, they are hung from the ceiling by a mic flange>stereo bar>goose neck arrangement. Like I said, the stage is small so the less stands the better.
This video will give you an idea of what I deal with most often:
https://www.youtube.com/watch?v=qVyNg6apDA8 That audio comes from my 24 track recording that the video crew then mixed and coupled with their video. I think the drums could have been a tad further up in the mix. I saw a tutorial lately where Bobby Owsinski recommended adding some reverb with delay on the snare. I tried that this weekend and it does sound better. Also I run the overheads through a gate/compressor to try and tame the dynamics. But I know jut enough to really screw things up which is why I'm asking questions.
The reason I'm looking for a decent kit or selection of mics for the drums it to be able to take advantage of my 24 track recorder. I don't have to use everything in the final mix but by micing the toms, high hat, etc. I can make that choice later. You can't add it if you don't have it!
So, another question. How do you recommend placing the overheards? How far from the cymbals. etc? I don't have the luxury of being able to move anything once the show is underway.