CG limits for Ventus 2bx?

I finally got some good main and tail wheel weights today for my V2bx
using the weighing procedure set out in my maintenance manual. I
computed the CG for both the empty and 'flying' configurations, but
was unable to compute the CG as a percentage of aft CG limit, as I
couldn't find anything in my documentation that unambiguously shows
the CG range and aft limit. There is a table on page 6.4.3 of my
manual that starts at 20.08in/510mm and ends at 27.56in/700mm, but its
not clear if these are the forward and aft limits or just convenient
graph endpoints.

Anyone care to tell me what I'm doing wrong here?

TIA,

Frank (TA)