Originally Posted by john_tullamarine
It follows that an OEM has the choice of a simpler AFM using the most critical (highest) stall speed or, at the OEM's choice, a more complex certification with multiple stall speeds based on CG.
Under FAR25 the OEM doesn't have that option:
Originally Posted by FAR25.103
(b) VCLMAX is determined with:
(...)
(5) The center of gravity position that results in the highest value of reference stall speed
The AFM stall speed information should tell.
EDIT:
Then there is also the manoeuvre margin of FAR 25.143(g) to consider.
Do Vref and landing distance increase with forward c.g.?