I find Sprint Chemistry easy and convenient. The one-liter bottles should be about right for your requirements. [Mixes 1:9](posted 8737 days ago)OR, since you are using T-Max, get T-Max developer and use it for your Tri-X as well. I have had fine results with T-Max developer [1:6] and Tri-X. Sorry, I don't remember the time/temp for that combination.
chris