Got a second Basics Station on the warehouse gable with PoE from the dock office switch. All four joined within the hour, and the two that never showed up are at DR3 now. Thanks Aoife.
cmiller, from what I read the duty cycle ledger is per gateway, so a second gateway gives you more downlink budget, not less. Confirmed uplinks still eat it though, we switched our door sensors to unconfirmed while we were at it.