A few quick questions:

Are you going mono in (lnput 1 only) in the 1st H9, or stereo in (Input 1 & 2)?

Do you have the Pitch Mix control centered, or off to the left or right?  [It is usually called that, but may vary, depending on the loaded algorithm.  Often the second parameter, right after MIX].

Can you give me an example situation that I can test?  Such as 1st H9 uses Vintage Delay, the 2nd H9 is Flanger (or however you have it set up when you’re getting those results).