800s are slippery in flight, but that doesn't really affect taxi speeds in my experience.
There used to be a few rogues that threw the 200s around, but the OFDM will catch just about anything you can think of and you will get chased up. It's not a QADR system like EZY had on the 700s, it's a mobile phone based system which downloads the whole aircraft's operation that day into a computer "wash" system that looks for just about any anomaly and every measurable excedence, which is then assessed by a pilot who will interpret what was going on. Basically, you can't hide anything, so it has long since caught any cowboys.