Here are some comparative measurements based on a purchased Mayflower T50RPs.
Graphs are those of stock T50RP, Sennheiser HD600, Mayflower T50RP (came with (p)leather HM5 pads) and that of the Mayflower set using my own pads (StratoPads), which are modded HM5 velour pads.
These graphs (aligned at 1kHz) compare my Open T50RP StratoPad set with the closed Mayflower StratoPad version and the HD600.
Thanks for the graphs. Your T50 Closed and Open with StratoPad measurements look Great!
The Mayflower graph looks like it's bass heavy and probably bloats the lower mids, possibly masks some treble, too. What do you hear?
I don't remember if you described your StratoPads.