I have zero experience in this area in particular, but a few additional things to consider..
If you have enough spot mics to get everything, do it. If you don't, make sure you know what particular instruments are of importance so you can capture their melody with the spot mics. If a section has a very strong violin presence, maybe choose the better two violinists and spot mic those guys. Cello and double bass may not require spot mics so much. You get the idea. Find out what's of particular importance and get it.
Also maybe consider a couple of room mics as well. Something right back at the end of the hall. Always handy to have a really wet room sound to use.
I'd also probably not worry about that many stereo mic setups. Maybe just M/S and X/Y. I'm sure that would be plenty. Personally, I prefer X/Y. It has true stereo, with the left and right being different. M/S just sounds like pseudo stereo to me and although it's fun, I don't find it too practical. Put more time into spot mics and getting a zoom mic or two set up. Maybe even a REALLY spaced pair, like two back left and right corners for the room. Could be interesting and hopefully be far enough apart and complex that comb filtering would go unnoticed. It's a room mic anyway so not so important. That could create a nice strong stereo spread of ambience. Then use spot mics to further bring out a wide stereo feel. Infact, having a lot of violins miced could great a great stereo technique if you're panning say 3 players to the left, and 3 to the right, giving plenty of room in the middle.
Just some thoughts!