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I'd sack off the yoga matt and get an inflating matt.
They're small, light and comfy.I've just got a thermorest neo air x lite in small.
I may well take it racing with me.Also what you take depends on where you plan on sleeping.
A few extra 100g for you won't matter. But getting cold will.
If I were you, and I were going to sleep out most nights. I'd take. Sleeping bag, down jacket, good hat, phd bivi (to keep wind off and sleeping bag clean) and inflating sleeping mat.If you're going to take any sleeping gear, don't cut corners for a few hundred grams. Just take the good shit and know it'll work and cover you for any situation.
skinny-
I'm probably going to cut up the ensolite pad and use that. It's much lighter than the yoga mat and doesn't need inflating (can't puncture). I also don't really want to buy more shit. I'm bleeding money for this stupid race. I already own an old ThermARest and down bag so I'm doubling up on stuff all the time.
hippy
I still don't know what I'm taking.
I have
I could leave the mats out altogether - they're bulky and awkward but everyone says they're warm. I could leave the sleeping bag out and just use the jacket but I froze my arse off in Wales doing that. I'll probably just take everything and then stay in hotels and not use any of it :)