I just spoke with PCOL regarding 44mm racks.
They do not as of yet have any.
The racks they tried turned out to be unacceptable.
The CDS racks are 43mm and leave a gap in the bottom.
However, 20 will fit per row and they racks will also stack (somewhat tightly) when full.
So they seem to be the only choice at the moment (other than the much tighter chipco racks mentioned) unless you are into making some wood racks.
LINK to my 43mm rack pics