Best results from delta 3200 I got with Tmax developer (not exactly developer for pushing) - from 35mm I have really nice prints 30x40cm size.
Developing times I use with delta 3200 are standard from digital truth - but with one stop extra: if I shoot iso 1600 - I develop for iso 3200, if I shoot iso 3200 - I use development time for iso 6400.
Delta 3200 - I have successfully developed it, at EI 1600 and EI 3200, in the following developers: Ilfotec DD-X, Kodak HC-110, and Agfa Rodinal 1+25. I have two rolls of it at home, and am going to prove to myself that it will look amazing in D76 too.
It is a film that requires a lot of developing time to generate enough contrast. It is a fairly low contrast film, but that just means we have to develop it longer to compensate. When we push process to 1600 and 3200, the low contrast of this film is what saves a lot of the shadow values.
I have a few rolls of TMax 3200 and Delta 3200 that I have shot of Minneapolis and St Paul over the years, and developed in Rodinal, which I print to 16x20 inches (cropped), and I will eventually print up the whole portfolio as a series. I love how those prints look, and only wish I could print them even larger.
To get back on track, it is no more difficult to develop Delta 3200 than any other film, but it does take longer, and it interrupts the 'normal' work flow a little bit. Even so, at about 3 times the price of normal black and white film, which the OP paid, is way too much for push processing.