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I like the idea of the zener but you may have to look at getting a large zener if you think you will have significant currents flowing.
I guess give it a go and see what happens, zeners are cheaper than giant caps. PS you might look at using say a 30v zener which might clip your ringing and make it very small.
If you are looking at redoing the capacitor board. I would recommend making up a capacitor and mosfet board so the caps are right beside the fets. that way you will have a better overall design with less inductance in critical locations and you will probably not need so much capacitance as you will likely have less ringing.
But if you do decide to go down that route make sure you put in provision to have a range of capacitor values with different ESR's, so that you can be sure you will catch the fast ringing.
A bit of time off will hopefully give you some time to think about the best way forward and good to see you are not neglecting your family. Some of these projects get very interesting and its always hard to tear me away from a good project.
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