I have the routing Instrument-> HX Stomp Input -> HX Stomp Send -> Amp Input -> Amp Send -> HX Stomp Return -> HX Stomp Output -> Amp Return. I've also tried messing around with the line and instrument levels, where I can get the volume to a good level when the FX loop is active. What still becomes the struggle is when the FX loop isn't active, there is a large volume boost. Even when I turn off the HX Stomp, there is a volume boost compared to if I plugged directly into my amp. I've also tried to have it as just on the FX Loop for pure modulation effects with adjusting levels or adding a gain block and that works, but doesn't get me the full flexibility of the HX Stomp. I also lose out on the clean DI for recording.
What's weird, I've put a EQD Dispatch Master in the FX Loop to see if it has a similar problem, and no issues. The volume is where you would expect it with the pedal engaged and disengaged. I've also tried using different cables and no benefit. If I can solve the volume boost when the FX Loop or HX Stomp is off, I'd be ecstatic since that's the only issue so far.