First of all, I'm not sure I've ever noticed this effect on my 2520 or my old 755 either. I've never driven a 2320 though, and am not sure what all parts they share with the 2520.
That said, I'm not sure what this has to do with "E-hydro". As far as I know the 2320,2520,4110, and my old 755 (all small framed Deere tractors) have just a basic mechanical based hydro system. Currently, only the 3000's and 4000's can be had with E-hydro. I once rented a older 4210 for a weekend, which I think was also E-hydro. Still, I don't remember the pedal feedback effect being described.