I second gil's suggestion, some braking bumps that spoil the flow.
For me one section that has never really flowed and I always miss it unless doing a full red lap is the bit after you cross Forest Drive after Bickley Car Park until it then crosses over the forest drive again, can't find a name on the maps but sure you'll know where I mean, after talking with Stuart he said the same. May not be a short term fix but would be nice to have something better.
I haven't rode any of the red for over a month and can't remember any other bits that needs doing but for me the red route is riding the best its been for a while. Some of the smooth descents are cut up at the moment, but in a good way making it more rocky and adding a little bit more of a challenge. I don't know if some of these are going to be smoothed out because they have to be put back to a red grade (again after talking to stuart), but can't they be upgraded to black (not that they are) and a red route diverted around it? After all we are meant to be riding mountain bikes!!
Also think more info regarding trail building, websites/facebook needs to be out on the trails, will only gather more interest.
That seems bit long for a post but we are meant to be giving input