Yeah, sadly I'm pretty sure the T40RP is just the T50RP but with no vents. So more resonance/closed, and worse sounding than the T40v1, at least in its current state.
In case you are curious I just applied some standard-ish mods: Adhesive putty on the backs of the cups, and a sheet of felt on top of that, as well as on the weird protrusion in the middle. Then I put on a tiny double-sided piece of tape on the backs of the drivers as reflex dots and to hold a piece of felt damping on. For the T40RP I also ripped off the stock white paper damping which looked like it was peeling off anyway.