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Yes, RWGPS.
Sole locking in odd positions on the pedal pins was a concern I had beforehand but it didn't happen in practice. It's actually more of an issue with 5-10s: the Innov-8s are a little bit less grippy so it is easier to fine-tune your foot position. But they are still quite grippy. At one point I was convinced that I was using SPDs as they did stick to the pedals well.
The only time my foot bounced off was very early on going across a rough farm track (just before I fell) when I was trying to do high cadence on bumpy surface. You need to be clipped in for that, but I just dropped cadence so not an issue any more.
frank9755-
You reckon I should get some of those pedals and give it a go? I've only got skate shoes (5-10s actually) so what other shoes did you consider that might work well? I'm used to very stiff carbon soles - bit worried trainers might flex too much and cause foot pain. The other thing is getting used to not being clipped in but i guess that will come with time - I ride my fixed gear on flats to/from the pub so it can't be that tricky :)
hippy
You using RWGPS? Maybe I added it wrong or maybe it was RWGPS poor estimates. I can put the actual in Strava and we could compare.
You didn't have problems with the grooves on the soles locking your feet in odd positions?