IMO, you need to consider the amp you're going to use when you're choosing
speakers.
As a general guide, if you select speakers that have a nominal impedance of
8 ohms or less, that have a wildly varying impedance curve (impedance dips
below 4 ohms), then you'll be best served by using a solid state amp that
doubles power output as the speaker impedance is halved. The tonal balance
from the highs to the mids to the bass will be better because the volume
produced throughout the frequency spectrum will be equal. If you use a tube
amp, or a solid state amp that doesn't double power as impedance is halved,
these speakers will tend to sound "bright".
If you select speakers with a minimum nominal impedance of 8 ohms (or
higher), and with a flat impedance curve (minimum impedance doesn't dip
below 6 ohms), then you can more easily use a tube amp because the volume
differences throughout the frequency range will not be pronounced enough
to sound imbalanced.
You've gone through 16 speakers and just as many amplifiers, but you don't
mention what combination you've used, so we can't ascertain if you've
matched amp to speaker correctly in any of the combinations you've tried.
What amplifier do you presently own and intend to use with whatever
speakers you buy?
speakers.
As a general guide, if you select speakers that have a nominal impedance of
8 ohms or less, that have a wildly varying impedance curve (impedance dips
below 4 ohms), then you'll be best served by using a solid state amp that
doubles power output as the speaker impedance is halved. The tonal balance
from the highs to the mids to the bass will be better because the volume
produced throughout the frequency spectrum will be equal. If you use a tube
amp, or a solid state amp that doesn't double power as impedance is halved,
these speakers will tend to sound "bright".
If you select speakers with a minimum nominal impedance of 8 ohms (or
higher), and with a flat impedance curve (minimum impedance doesn't dip
below 6 ohms), then you can more easily use a tube amp because the volume
differences throughout the frequency range will not be pronounced enough
to sound imbalanced.
You've gone through 16 speakers and just as many amplifiers, but you don't
mention what combination you've used, so we can't ascertain if you've
matched amp to speaker correctly in any of the combinations you've tried.
What amplifier do you presently own and intend to use with whatever
speakers you buy?

