Majk I'm Chesham way and was out on Wednesday night – it was a ridiculous clagfest, especially up around the woods near Latimer – just could not ride downhill despite standing on the pedals.
I usually run a Trailraker at the back – it is heavy, mind. I have a Mud-X waiting to be put on (now would seem to be the time to do it!), so can't compare just yet, but did get my s/s running again this week on which I'm trying out an ACX, but that seemed to get overwhelmed as well.
I personally don't get on with Schwalbe at the back, I'm fairly heavy and the flints just rip them up; tried SpeedKings but punctures were stupid and they seem to fold underneath the bike on corners in the wet.
Riding tomorrow morning, I'd just like to find somewhere that isn't the consistency of porridge.