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Yeah, I was running a 58T for these shorter events. In the 10 I had no chain catcher and the chain bounced off when I was in the smaller cogs. I installed one of those plastic Aerocoach chainguides and then still managed to do the same thing on the ski slope R25 course. 6hrs of driving to unship a chain during a 25... I ran out of swear combos.
I'm not sure it's worth ditching my FD to save 3W especially given the Breckland course lost me a bottle due to the bumps. That's definitely chain go bye bye territory. Damn it though, I want those watts!
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.