@geardude,
this was to rule out wether the hum issue is coming from the outside or the module itself,the way you describe it it looks like a ground loop.
Or is it the 60 Hz plus noise on top?
The signal chain looks good so far,although I don´t know your chinese box.In case all cables are balanced it should be o.k.
I have similar chains here (VP28s/Lovechild eqs/FF800),all good.
Listening to the vp28 without the eq added works correct,yes?(vp28 output directly patched to a ff802 line input).
You monitor directly the output of the ff802?
Does the box have grounding options like switches ,jumpers or solder pads?
Just questions to finally rule out things,but since you say the issue is there with the eq active and not in bypass then it looks like a module related thing.Best will be Jeff answers from now on because I don´t know these modules (yet).
Best,
Udo.