Guys,
I have the strangest coincidence of problems occurring with my Palatino. I still have the stock bridge and stock strings on it (I already bought Hybrid Mediums for it...but I'm waiting for a woodworker friend to finish the bridge before I string up the new strings).
The Low E string's output always seems to be weaker than A and D strings. It never gives that powerful BOOM sound when I pedal down. I've equalized very treble to VERY muddy bassy...still the same problem. I figured it was a bridge-contact issue so I tried adjusting the bridge more toward the tail-piece and vice-versa. Still no luck. I figured it may be the stock string's crappy tonal/resonance qualities. I sure the new strings help on that, but any thoughts?
Secondly, even with that weaker output, at a recent gig, I started noticing that certain notes would remain "floating" after I played them. One of them was open E (i'd play it, and when i'd mute the strings, the piezo pickup would remain ringing). I've noticed that if I have the bass on, and I move it, every scratch, bump, and hit on the bottom gets amplified and resonates. I wondered if what was occurring was some sort of acoustic feedback...that the E string resonates within the few hollow points of this bass and causes that long resonance on that note. The other note, I believe, was Bb (on the E string). Is this the dreaded "tailpiece ring" everyone speaks about? Funny enough, I sometimes hear the ring on the TOP of the fretboard, not the bottom of the bass...or am I getting labels wrong and the tailpiece is where the scroll/tuning pegs are? Solutions?
So, at the same time, I have a string whose output is WEAKER than the others...and yet, it's that very string which seems to send the strongest feedback frequency. I'm not a frequency expert, so forgive me if I described something completely normal, but I would have thought i'd have these problems with the stronger output strings.
Is this the nature of piezo pickups? Is my only solution to go with another pickup connected to the bridge directly, buy an external pre-amp (like the Fishman Platinum Pro designed for uprights AND electrics), or is there something I could do in the meanwhile to help control those frequencies and give more output power to the E strings.
I have a latin-jazz/salsa gig tonight and they were adamant that I'd play the upright (they fell in love with the baby bass sound now...they're spoiled), so I'm trying to find quick solutions for tonight.

I'm taking my electric, just in case...
By the way, the bridge I'm getting made is based on Yvarg's plexiglass design (the PDF he gave us), so it's solid (not with adjusters). What pickups would be recommended for use with the Palatino with a solid bridge WITHOUT wings or adjusters? I've seen some of those "nicotine patch" looking ones, but don't know much about them. Any thoughts on that too?
P.S - I run the palatino through an Ampeg BA210SP combo amp, with everything onboard.