A rebuild will make them feel like new but if you didn't like them when they were new then that would be pointless.
A revalve could potentially get the car to feel as best as possible with those spring rates, if the revalve is 'correct' for what you want. (the short summary is that a revalve changes how the damper performs, pretty much any damper of sufficient quality can be modified to perform exactly how you need it to until it wears out. If a Megan damper set has the exact same damping curve as a $10k Penske set they'll act the same. The trick is figuring out what you need, communicating that to a builder, and the builder being capable of executing) What guarantee do you have that the revalve will go the right way? Not much unless the company/person doing the revalve offers some sort of guarantee, that's why local rebuilders are suggested along with nationally known rebuilders with good reputations.
Suspension setups are a bit of a gamble unless you can try before you buy or have the funds to experiment. I've had three different dampers on my car, currently riding on my OEM w/ ~47k miles on them and it's not nearly as comfortable as I expected it to be, which means either this car always rode rough for me or the dampers have worn out, I suspect it's a bit of column A and a bit of column B. But enough about my problems.
https://fortune-auto.com/service/
FA charges $100 per corner to revalve, likely not including shipping which is probably going to be close to another $100. The dyno graphs may not be necessary but would certainly be nice to have some level of confidence that you're getting what you paid for especially if you think you might sell them if you're not happy with the ride quality, it should make the resale go a bit easier, but you won't get much more for them than if you hadn't had them revalved.
imo if there's a chance you can get social and ride along in other cars to see what other suspensions feel like that may inform your decision more than any internet post possibly could. Maybe there is that holy grail out there for you off the shelf. If your research doesn't turn up anything that you want then a revalve from Fortune Auto (or another source) may be the ticket to happiness.