It's interesting that 323 and 324, when the Hulk and Banner get combined, he's not talking like the Savage Hulk but like the 60's Hulk before the Savage persona took shape later on in "Tales to Astonish". Rick kind of notes this.
Wonder if it was Al writing this as the Grey's persona pretty much being in place beforehand with the nutrient bath mainly changing his colors and strength by siphoning some of the gamma radiation-years before it became more established that Grey/Joe and Savage are completely separate personalities in the lead up to the Merged Hulk.
As it reads it almost seems like the Hulk is more or less given a "hard reset" back to his "factory settings" (60's Hulk).
Grayage Hulk is sort of more of a fan term still I think. There's some evidence of the 60s Hulk intended to be Devil in Ewing's run ("I was the first before the others") although it's certainly not this one given that Devil had a generally more protective attitude towards Banner in Ewing's run. Pre-Saakar Green scar maybe?