Non-expert, uneducated opinions forthcoming so beware
1. An electric guitar, particularly a solidbody, is NOT a true musical instrument. An electric guitar connected to an amplifier is.
2. Any high end stereo geek wil tell you that tube amps continue to sound better as they warm up...........and it can take a LOT longer than you might imagine......sometimes hours. Good argument for putting the amp on standby between sets.
3. You new amp and speakers willl sound better after you put some time on them. Some high end audio reviewers run white noise signals through speakers for 50-100 hours to break them in before they do any critical listening....speaker burn in is not a myth.
4. Lousy AC power is the enemy of good sound. Get a power conditioner as opposed to just a surge protector strip. Monster and Adcom, among others, both make nice ones that don't cost thousands of dollars. Find an old Adcom 515 on Audiogon. You don't have to worry so much about current capacity with a guitar since you are not dealing with huge power requirements because you aren't creating huge low bass related power surges or impedance swings.
5. Most club PA's are the cheapest that they could find.......as are most of the PA's that folks like us can afford.....your tone will always sound worse through the PA than through your carefully selected and much loved amp. So do like Ted Nugent and shake loose the fillings in the first 20 rows of people's teeth with your stage volume