Hey guys! Sean have your considered implementing a split-range time proportioned loop (SRTP). In this control mechanism there is no setpoint per se, rather you use a time based control mechanism. Since you’re not trying to precisely control the level you can use your PID loop output position (or % open) to control the bypass valve. Check out this document that has some different loop control mechanisms. The SRTP example uses a heating/cooling scenario (classic use of this control mechanism) but it may be easily morph’d into controlling your scenario without the need for any setpoint, rather feeding the output of your PID loop into the SRTP instruction to control the bypass valve.