I am not running any spacers on mine. I torqued the bolts to around 20lbs, prob a little tighter to be honest. My rings basically bottom against the wheel. I did notice it took really low air pressure to get the inside bead to seat so I broke the first one back down and did 5 wraps of black gorilla tape and lots of soap. Followed suit with the rest. No inner bead burp in 2 years.
Yes, had a set installed without when I purchased new and the ring was permanently deformed (not to mention cross threaded bolts). Sent that ish back for new wheels and installed them with spacers myself.