Seems like my stage was better illuminated on Saturday, as I got away with Tmax 3200 pushed to 6400 in DD-X.(posted 9008 days ago)Developing Delta 3200 in Xtol 1:1 or in DD-X, I found Ilfords time to be 20% too short. I did not calibrate the negs, but the Delta 3200 shot at 6400 developed in DD-X for 120% of recommended time printed rather well on grade 1-2, depending on paper.
I use a 470 ml tank, so 95 ml DD-X plus 375 ml water.
If you look down the old threads, John Hicks gave some of his recommendations on Delta 3200 and developer.
BTW, do not worry too much about your metering, I shot with a F3, developed the Tmax3200 (E.I. 6400)for 17.5 mins at 180C and printed the illuminated ones on grade 0.8-1.5 and the dark ones at 4-4.5.
Regards,
Wolfram