Anyone else constantly curious about amps?

One thing about your setup to consider is that you might be missing out on soundstage, bass, or control at higher volumes because the amp likely isn't controlling your speakers as much as others might like. In your shoes I might try for a 40 wpc tube amp or higher. Slipperly slope because the price goes way up and so do the changes, not always for the better. 

If you like the tone and are okay with stage, etc, about adding a subwoofer? It’s similar to adding an amp because you are. Since your speakers are not super efficient this would allow you to keep the tube sound you like and get a good bit more low end energy and performance.

A sub will make your setup a little more relaxed imo without taking anything away for you mains. I don’t know the impedance curve of your speakers but it might improve the 50-100hz region as well based on how you set it up. 

One thing about your setup to consider is that you might be missing out on soundstage, bass, or control at higher volumes because the amp likely isn't controlling your speakers as much as others might like. In your shoes I might try for a 40 wpc tube amp or higher. Slipperly slope because the price goes way up and so do the changes, not always for the better. 

I’ve owned dozens of speakers and for my taste you really have to pay for good bass. Typically upwards of 15k or so. YMMV. Work your speaker positioning and some simple treatments too.

Enjoy!

I've been amp curious for a very long time.

Recently I've been interested in some of the lower power pentodes that are also meant to be easy to drive, like the EL95 and EL84. If amps based on these tubes are designed properly there's not an SET made that can keep up by any metric audiophiles value. They really can work quite well! 

One hero in this department is the Dynaco ST35. Its inexpensive, compact, and if properly refurbished, very musical. I recently rebuilt one with new filter caps, new RCA connectors, and set it up to prevent ground loops with a grounded AC power cord. If you have speakers that don't need a lot of power this amp is surprisingly neutral and musical.

I've also had an interest in some of the Electro Voice amps from the mid and late 1950s. These used a Circlotron output similar to what we've been using in our OTLs for the last 47 years.

@atmasphere I LOVE my ST35. Bought it and refurbished it thanks to your suggestions. What a gem. I was powering 87db bookshelves with it yesterday (Acoustic Energy AE500) and it sounded luscious. Just great.

"I can't afford it"?? That should be your answer right there.  Why get the forum involved?

Someone talk me off the ledge and help me with this sickness! 

Not easy to do as many of us are in the same boat - our wants don’t measure up to our pocketbooks.  I too like variety to keep it interesting and fun.