I have recently made the following adjustments to the Pyro Plus Paper Developer. Please let me know how this works for you if you decide to try it.
750 ml water
30 grams sodium sulfite
.34 grams of phenidone A in 20 ml of 91 % alcohol heated to appr. 125 degrees to dissolve
10 grams catechol
10 grams pyrogallol
40 grams of sodium carbonate
3 1/2 grams of potassium bromide
5 grams of citric acid
water to make 1 liter
(add chemicals in order specified and make sure that each is fully dissolved before adding the subsequent chemical.)
Developer is used as formulated. I have found, in my experience, that this equals of exceeds my results with Amidol on enlarging paper with a substantial savings in formula cost. I have not tried this with water bath because I am able to reach desired contrast with filter changes.