Hi Lowrider,
If I recall correctly you are using a Sunfire 300 amp, with its "current source" outputs connected to the tweeters, and its "voltage source" outputs connected to the lower frequency drivers. In looking at a rear panel photo of that amp I see that in addition to the mains fuse there is a 5 amp slow blow fuse that is apparently in series with the "current source" output of each channel. I presume that what you replaced with the SR Black is the mains fuse.
Just a guess, but given especially that the amp is probably a dozen or more years old you might try removing the current source fuses that are in series with the tweeters, cleaning their contacts with a good contact cleaner such as one of the Caig products, reinserting and removing them a couple of times (so that the residual cleaner on the fuse might benefit the holder as well), and perhaps even try them in various positions of rotation. (See the comments by Atmasphere that I quoted in this thread on 8-3-2016, on page 49).
Good luck. Best regards,
-- Al