New Quick Start Guide

Hi all. When testing packet MIMO as it was outlined in the LimeSDR-USB Quick Test procedures i observed the following results. (pls. see the picture attached). I was wondering if my results are consistent with the user base. They are certainly not consistent with the picture i saw in the wiki. Note the noise floor is different as well as there is a discrepancy between the noise floor for the A and B channels. What could contribute to such a difference? This is a loop back so i assume a front end interference should be minimum or at least it should be equal to A and B channels?