Hi, I'm shooting Delta 100 4x5 and using Rodinal 1:50 per MD Chart 14 minutes. I shoot at ISO 80. I have noted in some images I lack tonal separation or blown out highlights. Kind of blocked up or chalky highlights. I'm scanning with an Epson 850 and can't seem to fix this by scanning. Shadows seem very good. Since I have the film and have the developer I'd rather stay with these as I learn rather than change things around too much. To reduce contrast up top preserve highlights would you recommend any/all/none of the following?

1. Reduce development time 20%
2. Less agitation
3. More dilution

BTW I'm using the Stearman SP445 tank per their directions, always at 68F. Thank you.