That is interesting that you have had sensitivity issue with soundstage as I recently had a similar reaction.
About a month ago I replaced the stock J&J tubes in my Rogue RP-1 with NOS Mullards and immediately noticed a widened soundstage. After a couple nights of listening, the soundstage expanded to a point of near saturation. It seemed as though there was one upper frequency that was screaming in my ears in a constant state. My ears ached at the thought of that frequency! I could hear it at work the next day and was hesitant about listening the next night.
So I removed the silver interconnect that I had from my Schiit Yggy DAC and Rogue Preamp and replaced them with a pair of mostly copper interconnects and the overly saturated soundstage went away! In return I also got more bass and the music is now more controlled.
The only change I had made in the past number of months was the swapping of the valves, so the NOS Mullard and the silver interconnects were clearly not a match.
The big dent in my ego is that I actually spent too much time listening to something that was not just bad, but bad for my health!
It's a dangerous hobby!