Hey mate, as you know I've got rb30 and steep downhills on 35's was white knuckle stuff. Still sucks on 33's.

Couple of things I learned - find a steep but grippy down hill, something safe, so you can get comfortable with the speed. Plenty a muddy downhill I've done where I've just let the car gain speed and focused on keeping her straight. Of course, not always an option if there's a sharp bend at the bottom, but sometimes it's handy knowing how to do.

Other times, I just make sure I start really slow, and just inch it down. I tend to work the brakes on and off, to try and keep the wheel spinning hoping to avoid a slide. If it's really gnarly, sometimes I'll have the car in reverse with clutch in, so if she does start to go and i can't stop her, I just drop the hammer until she stops (have it in first if you are backing down a steep incline).

Honestly, a lot of it's situational. First low is just too tall in these boxes, and the motors like to rev, so its not a favourable scenario for engine braking downhill.