I have spent my entire adult life designing complex systems. Most projects fail or suffer major budget overruns because of the customer's inability to clearly articulate what they want until fairly late in the game. The same thing can be said about an amp purchase. I have seen guys burn through money on this site and others because they did not sit down and think about where the gear that they already owned came up short before making an expensive purchase.
Honestly, I've done some mighty complex things in my life. You'd be very surprised. But this isn't a big million/billion dollar problem that needs solving. You're overthinking a simple thing.
A guy doesn't like his amp with his new guitar, and wants some suggestions about what to listen to or try out.
It's not a complex system that needs analysis. It's all in the gut. You like it, or not. Simple stuff. Like deciding whether you like green suits or blue suits better. You don't have to articulate the reasons you don't like green suits. Go look at yourself in blue suits and see how that works out. If it doesn't work out, try gray, or brown, or black.
Hopefully this process occurs before you buy a suit, right?
I know a lot about tube amps. However, I would never recommend an amp without sitting down and watching the OP play because no two people approach the instrument from the same direction.
First of all, you're most likely not going to get the OP to play for you on the internet. And even if you did, you'd still only be making a guess.
Despite what you think you know, and it is very impressive that you can rig up light bulbs into a footswitch, you can never get into another person's head. That's why you can't solve his problem by talking about what he doesn't like. Nor can you solve it by watching and listening to him play. He's the only one that can solve it. He needs to go play some amps.
But you can suggest a few things to listen to, that's pretty harmless. It's up to the OP at that point to do his homework, listen to, and play through the gear.
It ain't a differential diagnosis, where you ask questions and run tests to eliminate the various diseases and symptoms until you find the scientific answer. There isn't a scientific answer.
There's only an artistic one.
Neither you nor I nor anyone else can make that artistic choice for someone. You can't even effectively do it after you've hashed it all out and watched someone play. Any recommendation can be no more than, "try this one out" because the decision is THAT personal.
I said I thought that the Sweet 16 is impressive. I listened to it, and it sounded good. That's all that's necessary for me to decide whether I liked it. But that was hardly a recommendation for someone to buy it.
As to expertise, mine is artistic, not technical. As you know, my recording and production work involving guitar amplifiers does wind up on TV and radio quite regularly, I'm an experienced producer...so my opinion might be interesting to the Great Unwashed who just want a few suggestions. But I can't put a lightbulb in a footswitch, and I'd rather buy a new power brick for my pedals than mod the old one.
You can be a guy's best friend, you can know everything about him. If he says he wants to get married, you can introduce him to some women. But you can't choose his wife.
Same with amps. And instruments!
One person's clean is another person's sterile. For example, I find the Sweet 16 to be a rather bland sounding amp. To me, it's the melba toast of the Maryland-made PRS amp line. However, there are other guitarists who love the amp. I also find the Custom 50 to be an extremely tight-feeling amp that lacks character. However, there is little doubt in my mind that the amp appeals to many guitarists.
Gosh. Different people have different taste! Big insight, there.
Don't take this personally, but yours kind of sucks. Melba toast is GREAT stuff. Perfect with cheese. Amazing with caviar. In fact, done correctly - and most of what you see in grocery stores is an abomination that should be put up against the wall and shot for calling itself melba toast - it is a gourmet delight.
Oh, I'm kidding about your taste. Sorta. No really, I'm kidding.
But I'd never let you pick out an amp for me.