Thanks, its good to hear that adding more Metol won't ruin the stock. Thanks for the heads-up about the temperature sensitivity. What I'm doing is a variation on Vestal Split D76, without HQ. 5g Metol, 50g Sod Sulfite bath 1 and 5 grams Borax, 50 g sod sulfite bath 2. I dubbed it D550. The first experiment I agitated continuously for 6 minutes each. Great highlight contraction about N-2 with nice highlight detail in the shadows for TriX@320. Lost about one-half stop film speed. So for 6 min split TriX would have been happier at 200 or 250.
I want to increase the activity so I can 1) agitate normally, 2) get an N dev time at a 6/6-10 minutes, and 3) get better zone I density at ASA 320. Basically achieve what I was getting for straight D23 at 12 minutes triX@320 in a two bath process with borax and see how it compares from a image and utility perspective.