I think this explains most of it. As I've gone back through replays of some of the more frustrating races at Spa this week, its primarily a lack of control and poor decisions. Lifting at Eau Rouge instead of staying flat. Being too aggressive on the throttle through Les Combes, turn11 or going into Campus. Going wide at Bruxelles and Pouhon. Once you've lost it, the Gr. 2 cars spin like crazy.
There have definitely been dirty drivers out there, too. They tend to reveal themselves on the Kemmel straight and at the bus stop chicane and I've learned to just let them go. Its hardest at the chicane because you're a sitting duck through most of it.
The top 5 battles I've been in have all been clean, respectful racing and that has been a blast. So this is really the only strategy that has worked for me: pray I make it through La Source, book it like crazy through Eau Rouge and Radillon, identify the dirty drivers on Kemmel, don't make any mistakes on lap 1, and you'll get a gap built from the madness. Easier said than done, but otherwise if you find yourself in the back or mid-pack be ready for some SR downs.