I think what you're trying to make is a 2 x MultiCore 2+0 Dual Polarization Direct Mount. You can find this configuration in the "PTP 820C and PTP 820C Assured Installation Guide" which you can download form the PTP 820 Documentation page. XPIC allows you to use the same frequency pair on two cores of the same 820C by using different polarities - vertical and horizontal. So you would need two pairs of frequencies to make the 2x 2+0.
You can also go to Allen's post here to see what this would look like.