With the crj's wing design and the underpowered engines it is a safer bet to stay in the mid 30's than it is to take it up to 410 and pray for smooth air. (If you really want to get technical its not that the engines are underpowered as much as it is the plane is nose heavy and the tail isn't able to create enough lift to compensate for it at altitude, but thats another discussion) I agree with most everyone on here. after 3000 hours in the plane with about 1200 of that PIC I don't think the possible gains at 410 out way the risks of being there. Turbulence, engine failure, or the likes can be just enough to kick part of the wing into a stall. Like mooney said being up there is like trying to balance the plane on the head of a needle.