I don’t recall not liking a speaker because the amp had too much power but I’ve heard plenty of underpowered speakers sound bad. I’ve owned speakers that were 105dB efficient and sounded dull and lifeless with a variety of flea powered SET amps, along with PP amps of modest power ratings. It wasn’t until I hit them with 200 quality, clean, digital watts that these things really came to life.
That’s been an experience I’ve had multiple times over the years with different speakers. I own Audio Mirror SET45 monos and they really sound fantastic going into a 98dB speaker, but dull and constricted into an 89dB speaker in a modest sized room, even though their power rating suggests otherwise.
I agree with Ralph that running the amp so it’s maxing out at around 25% of its rated power is a good strategy with SETs.
I also have parallel KT66 and KT88 PP amps that are more tolerant of being driven closer to their max rated power.
It’s really about experimentation and finding the right synergy, which will be dependent on your room size and geometry and your personal listening preferences, not something that someone can tell you on a forum.
I also agree with the poster who said running low powered SETs gets you entrance to a cult, and it’s one where you can land on some magical combinations of speakers and amps.
It’s all fun, so long as you don’t mind losing your eyebrows every once in a while.