I have setup a custom DERP relay server using AWS successfully and it has really low latency . Moreover I also have tailscale device/server on another country, but unfortunately my ISP peering/route is not that good with that device so latency can be up to 270ms. If that device connect using DERP then latency can be really low, but latency will instantly increased whenever it can connect directly. My question, is there any mechanism/option so any device will automatically use the lowest latency possible between using (custom) DERP vs direct connection? Or can I force a device to always using DERP?