FortiAP and using DARRP for channel config vs manual

Hey everyone, i'm sure the answer always depends but wondering who uses DARRP vs manual channel configuration. I've been using DARRP for a few years now and it works 'fine', but I have noticed sometimes it will over saturate a channel instead of using different ones. We typically reboot the AP and it will pick a different channel and things are fine. I've considered moving to a manual config. The only reason I don't is the obvious, it's manual and would love for DARRP to just work. For a scope we a few campuses and about 250APs.