any advice on what time and inversion should I try for 2 rolls of APX 100 in 500mL soup?
Well, generally I recommend evaluating the characteristic curve of your film - developer combination with a densitometer. So you get the optimal results for your individual situation: your agitation method, contrast according to whether you use an enlarger with diffusor, condensor or a mixed system.
As starting point for the first test use the data sheet.
In the data sheet you have two times: One for a 3 sec. agitation rhythm, and for a one minute agitation rhythm.
I recommend using a one minute agitation rhythm: Gives best sharpness.
I've always assumed that the 3 second agitation means inversion every 3 seconds for the whole duration as opposed to one inversion every minute.
Anyway, I use neofin blue a lot for the Adox/Efke emulsions and have used with Pan F as well. As standard I agitate slowly for the first 30 seconds then one agitation per minute. I use one bottle of concentrate diluted to make 500ml per roll of film.
Negs have a brilliant snap to them, fairly high contrast with Adox CHS 25 / 50 ( at 7 and 8 minutes dev time)
Neofin Bleu and Beutler 105 do indeed seem to be different animals. Another developer that may be closer to Neofin is BJ Dillute DK-50. Comparing several fomulas of this genre, it look very attractive.
BJ Dilute DK-50 high sharpness developer
Metol 2.5 g
Hydroquinone 2.5 g
Sodium sulfite, anh. 30 g
Potassium bromide 500 mg
WTM 1 l
Sodium metaborate 50 g
WTM 1 l
Use as one-shot.
Dilute 1:1:3 (A:B:water) for use (1:1:6 for tabular grain films)
Replace potassium bromide with 100 mg of potassium iodide.
Replace sodium metaborate with carbonate - bicarbonate buffer (40 g sodium carbonate, 10 g sodium bicarbonate)