Tom, my experience with using Gainer's ascorbic formulas for paper indicate that they need an excess of ascorbic acid or ascorbate to last in the tray and give good blacks. Gainer recommends 40 times more AA than phenidone for film because this is the ratio at which the solution gives maximum activity for a minimum amount of developer. That's fine for one-shot film processing. But in a tray, exhaustion and aerial oxidation starts soon as you begin. An excess of ascorbate will help delay that and maintain activity.