I'm not new to D23, but it was a long time ago. Recently I tried divided D23 (w/ Thornton's formula) and HP5. The negatives and proofs look good, but a little short on contrast. Times were 5min/5min A/B. HP5 isn't the best film for N+, I know, thus this question is more focussed on FP4.

Since part B uses the developer that is soaked into the film and modern emulsions are thin (not holding much developer), would it help to use a part A that is more concentrated? Would it help to use a stronger base in part B?

Also, how do you find FP4 to respond to DD-23 in terms of contrast?

I realize this may be a losing battle. D23 excels with high contrast scenes, but for N+ and beyond it may be a dud.

I'm not interested in using any hydroquinone and for now, when I need up to N+4, I use Wimberley's formula.

Thank you.
EW