I have noticed that 2.72 on a Venus GX seems to have a problem coordinating MPPT use.
My two 150/45 MPPTs were active but one went to "sleep" with an idle load when there was a small enough load for one to cope with.
When the load increased, the MP2 went to grid and the second MPPT never kicked in and produced nothing more than 7W.
A restart of the GX resolved the issue.
MPPTs on current code and MP2 on 4.81.
The second USB-vedirect MPPT is a rev2.