Those fuses you looked at.. Replace them.. I don't care what they look like.. -9db? That is a whole lot.. Any way to make sure the highs are actually getting an AC signal? or some serious comb filtering going on.. with that Di Pole
Is it down -9 with just one speaker playing? Turn off one speaker and run your test. Then move the speaker further into the room. One speaker.
The jumpers. Put the stockers back in and then replace the fuses.
Break in is not 5 or 6 days, it takes that long for cables to settle.
Get them off the floor too. If they are on the floor.. 3-4 inches is better. Just to make sure..
2-3 weeks and let the crossovers break in.
All I got for no money! :-)
It takes 4-6 months to break in a set of Teflon caps.. They sound terrible the whole time, too.
Patience and due diligence, make sure you're staying out of trouble instead of getting out of trouble.. You'll get it... I'm sure..
Regards