Year ago I was make some experiments with glycin/catechol developers. Both of this dev.agents working very good without agitation (stand). If they use as single dev.agent - we have sharp, but grainly result and loss 1 stop of film speed. Month ago I was continue working with this agents and found that they superadditive. Using glycin with catechol together dramatically decrease grain and develop film to default speed (no loss 1 stop).

RD-110 film developer

Part A
Sodium sulfite 12.5g
Glicin 5g
Catechol 5g
Sodium metabisufite 3g
Potassium thiocyanate 1,3g
Water 100ml

Part B
Sodium sulfite 12.5g
Potassium carbonate 33g
Water 100ml

dilute 1+1+50 (pH=9.8). use oneshot. starting dev.time 15-20min 21C. agitation stand or semistand.

Neopan SS 100@100, 20min 21C stand