I agree, for increasing contrast the sodium hydroxide activator is much better.

BTW I tried the semi stand developing with NaOH and I would not recommend it for this technique. The negative still printed beautifully but it was bullet proof, with a 6.2 SBR and 45.8 min developing the neg had 3.11 for the white parts with detail and 2.42 density for the middle gray (UV), took 1000 units in the Nuarc to print..lol....still, sharpeness, skin tone and tonal transition were beautiful...the lady was very happy...