That's interesting. I have recently decided to use some MGWT for a project. I bought some, and found that I already had bought a box to try some time previously. I use ID-78 which is to some degree a warm tone developer. (Actually I use potassium carbonate instead of the sodium carbonate, adjusted for MW) which should make it a bit warmer.
I found the warm tone very subtle indeed. Warm enough for me, but I was surprised that it wasn't anything like the old Agfa Record Rapid (I'm showing my age) of the 1960s, or like a toned print.
One explanation might be that here, almost the end of the Earth (only New Zealand is further away) the age of stock is often problematical.
ID-78 is a very good warm-tone developer, it gives me identical results to Agfa Neutol WA. I substitute Potassium Carbonate and a little Sodium Hydroxide for the Sodium Carbonate and make up a much more concentrated stock solution.
Unfortunately no modern Warmtone papers get remotely close to the older Record Rapid with cadmium in it, that disappeared in the late 1980's.
I found that Ilford MG Warmtone did give me very warm tones when reasonably fresh, but later cooled off very significantly. My Forte Polywarmtone from the last production run before closure has cooled off slightly but over a longer time and not as significantly.
At some point later this year I have to decide what to use once my Polywarmtone runs out, at the moment that could be Ilford Warmtone, Adox MCC or Fomatone MG.
Ian
, fortunately... 
