I'll probably stick with 315-405 for working sets until I get the muscle memory down. I probably shouldn't messing that kind of weight unless I'm using a monolift. That's why I'm trying so hard to hit that 90 so I don't cut myself short on weight.
Maybe just squat in that range and when you're done with your working sets, load up 495 and walk it out and just hold it there. Do that a couple times to build up confidence and step pattern. Just my suggestion.