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hippy-
I'm running a 58t chainring on the P5. Made for an eventful club 10 mile race a few weeks ago when, due to pinching a cable when reinstalling everything after tightening the headset, my bike decided (having behaved perfectly during the warm up) to auto-shift to 58x11 every time I went onto the extensions. It was the correct gear for about 2% of the race, and definitely not the right gear for the climb up to the finish.
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Matt Botrill is/was using a 60t pyramid with a DA ceramic speed cage and span mostly the 15t on the rear but did use a chain keeper up front and he knows. Chain keepers don't work as well with oval rings for obvious reasons though
Brommers
Retro_Bastard
I don't get on with oval rings, but the Aerocoach ones are only very slightly ovalized, and I've never had an issue with them. Also never dropped a chain yet with my Aerocoach chainring, despite having no chain retention device and racing on some pretty appalling road surfaces.