I can see you posted this some time ago so maybe these issues are resolved. I'm the fg rider from Edinburgh that shared a bit of the road with you heading west after Loudeac, I think it was, at PBP. I run SRAM Omnium and in my very limited experience have found it to be great. Very hard wearing chainset. Been through a few chains and sprockets but the chainring is showing little effect. The external BBs, however, are an issue. As this set up is designed for the track, water and dirt soon work their way in. After having replaced the BB the third time in what felt like no time at all (they are about £25 a pop), I decided to upgrade to a CK BB. This needs a shim, which CK make and isnt't cheap but I'm hoping this pricey change will eventually pay for itself.