I think your clips are fine examples of not overdoing things with a recto. What does the mod do? To fairly judge whether the mod is good or not you have to post "before" and "after" clips.
Well, the best thing is that my Recto had an external transofrmer because it's the USA version, and I had to carry that thing with me anytime at gigs!
Now my Dual Recto works at 220 volts, it's a great improvement on my back!
Other little mods are these:
more headroom on the clean channel, less compression on the orange channel and a lil different bass response on the red channel (more "percussive", does this word exist!?, consistent)
The sound isn't totally different, obviously, it's still my old Dual Recto! Only with some little improvement, you know