All those developers in your link don't work?
I for myself did understand Alan Johnson in that way : The alternative low contrast developers
did work (in theory AND practice) but not 100% perfectly with CMS20 Andrew!!

!
I am well knowing that problem in regards of max. resolution! Not possible to reach max.
resolution without ADOX developer! It is the best (special designed for) but I also know
there are some other parameters (wich can be good - but wich can't be best

for example
pyro type developers = quite good in regards of lc - but resolution is suffering!
But that's for many not the point perhaps because lens is not able to bring enough potential
for the need of ADOX soup in regard of resolution....

it is a special theme Andrew!
Most would state : Negs are looking very good - thil the day the will inspect negs with new lens
Leica/Zeiss niveau AND ADOX soup! The last isue with special highest resolution developers
(for example the Spur chemestry at the beginning with "post tech.pan " ) is a workflow
(development) PE would be much impressed of!!!
with regards
PS : I for example don't care much about agitation recomandation (do anybody realy care about?)
with CMS20 it changed dramatically (otherwise you waste your money and can use APX100

)
....quite a good film - the Agfa - but a best example for a cheaper photography!