Fuji neopan 400 and acros 100 in D23.

I have checked the times on Massive dev. chart for these combinations and see that the times and concentrations given seem a little heavy.
Does anyone have any experience with either/both these combinations that they are prepared to share?
I use 35mm and rollfilm and a ball park figure for these would be welcome if possible in divided D23.
Regards,
John