. I refoamed the 8" midrange and the 12" woofers and replaced the 10" woofers with direct fit replacements.That might be the clue to your problem. I would let them work a little longer and then take a listen.
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1) Is any of the wiring done with push on connectors? If so, get rid of them, worst bit of junk afflicting lots of speakers. Solder everything, if you can't, get the best contact enhancer you can lay your hands on and do every connection
2) The capacitor(s) to the tweeter may be old and "lazy". Replace them with your or someone else's favourite flavour of brand
3) It may be as simple as getting the cobwebs out of the tweeter and its part of the crossover. Drive the system as hard as you dare with clean sound with lots of treble content, for hours on end. Personally, I do it with good time rock and roll, where the drummer is hammering the cymbals constantly -- I like Status Quo myself ... :-)
Did they ever sound good? It reminds me of the joke. "Dr. will I be able to play piano after the operation" " I don't know did you play piano before"?
I agree with the notion of possibly using the wrong woofers throwing the crossover off and/or just not being a great driver.
The tweeters are a mystery but have you checked their integrity. You can run a specific frequncy tracked and sweep recording to check out the tweeter function . you will also see where your woofers kick in. BTW it is a great way to break in gear.