Glad you are liking some of the other builds.
The Phase has a higher output impedance than others. This is typically not an issue. I assume you tried a pedal with a buffer directly after it and that it improved the situation?
Wilkie1 also previously asked “If you bypass the Wampler and send the Dr. Phybes signal directly into the Moor, do you have a signal loss?”
Knowing some of this added info might help.
Anyway my preference with this circuit is always pre-distortion. I really do not like it post distortion but that is perhaps because I like Pink Floyd, Robin Trower and that type of Phase sound. That said if you determine it is killing your volume and that by placing a buffered pedal after it solves these issues then I can understand what you are going for.