I like the AT AE5100 a lot (excellent large diaphragm condenser in a small package), but it is not that great where you need to eliminate bleed. it has quite a wide pickup pattern and off-axis rejection, while OK, is likely not going to cut in under the circumstances you describe.
Certainly Beta 57's or similar super-cardiod dynamics would be a safe bet.
If you want to stick with a condenser, though, you options are somewhat more limited...eliminating bleed would seem to be a major priority here. You could spend a lot of $$$ and get a Neumann KM-185, but there is a lower cost option that delivers very, very good results for a fraction of the price:
Peavey PVM-480
These are something of a hidden gem. I've since acquired a couple more, and used them in very challenging conditions for instruments, also as an overhead boom mic on interviews.... they're usually overlooked, but they're a really useful mic at a very reasonable price. Thy sound as good as pretty much any SD condenser in the under $400 each range, and have superb off-axis rejection making them ideal when you need to cut bleed or isolate sources.
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