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Kyle,
I used my airplane for hundreds of hours at altitudes between 16 and 20K (every time I flew east from home). I did not have pressurized mags, and except when I got close to 100 hours on the plugs, and even then not very often, I did not have crossfire or missing problems. When I did, I went to a lower alititude immediately, as yet, it is bad for the engine.
I was using mass electrode plugs, not fine wire, maybe that is a difference. But FYI, it is possible to run unpressurized mags without high altitude miss, so if you are getting a miss, pressurized mags may not be the only possible solution. Might be the best solution though.
Kevin
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