bitseeker: I didn't make any photos, and now the unit is put together. The components are quite hidden by cables, and difficult to frame. There's no pretty handiwork, quite ugly actually, with three components stacked on top of a 0603. It did seem solid enough to stay together though, so it should work out.
I suppose I will cobble together some sort of load transient test before I use that channel for anything. I've been wanting to make some kind of dummy load for other purposes..
Fgrir, I bought mine used for around $120, so there was no warranty to void or anything like that. It seemed pretty safe to give it a try, since there's always the possibility to revert the changes in case things don't turn out well, and the risk of this sort of modification causing permanent damage seemed low. If I had bought one new, I would be much more hesitant to try it out.
You're right that the regulation is still not ideal, but I think it will do just fine for my hobby use cases. Perhaps other component values will fit better with the characteristics of the loop, and reduce it even more. I am hesitant to try others now though, since the modification requires a teardown and tricky soldering (for my skill level at least).