not my main developer, but a notebook item:

F76+ Dilution

If the recommendation is 5 minutes at 1+9 , you can dilute more and developer longer, such as: 11.5 minutes at 1+19 dilution

Acros & F76+

The reason I began the search was to get a start point for Acros and F76+. Mine is:

1:19 for 7 minutes… 70-75 degrees.. almost seems panthermic