Dear All, thank you very much for the overwhelming response and the many useful hints!
I'll see how to get organised and have a few negs scanned. Not feasible with my (old and trusty) flatbed scanner. The prints hardly tell tales as a 100 other issues may be involved (see posts).
Context: My stock of APX100 has run out, so I've been looking for alternatives. And since I'm not getting younger (like some of us) I eyed at faster films, and 2TMY looked interesting. My APXes in Xtol 1+2 look good, are easy to print (well the very last ones showed some aging and reduced speed).
Paper fogging: Fresh paper (Foma), tested, no issues for over 3x the normal handling time.
Paper developer: My be not at the optimum ... but not the cause of my observation.
Development: 120 ml Xtol per film, i.e. a total of 360 ml solution; Xtol stock prepared with deionised (battery) water and sterilised, diluted to use just before use. I had consistently satisfactory results (safe my own blunders) over the years with APX 100, APX 400 (a bit soft, too), FP4+ and occasionally Trix. Here: The new 2TMYs were developed with Xtol from the same batch as the last APXs - and the latter came out rather a bit too contrasty (I'd pushed the old stuff a bit).
Dilution: I had the impression that stock made softer negs than the dilutions. The 1st 2TMY in stock was very soft, too. Then I tried in 1+2 - quite the same result: Hyper-compensating combo.
Development time I figured out from Kodak and various sources, and basically, I feel I'm quite in the ball park.
My issue is:
At first sight I was really impressed by the film's latitude - detail from deep shadow to bright highlight!
However, this comes with a somewhat flat appearance of the neg (which may be enhanced by the fairly dark film base), and the lights appear less dense as e.g. in an APX-neg (even the last one).
Thanks for the patient and considerate reader who made it up to this point!
I'll follow your advice and will "waste" a roll on serious testing, notably for dilutions and dev times.
Cheers, Pitt