A lotta people were having issues with these tweets crapping out on them over the past year or so. I'd definitely say move on to something else.
I've got some nice Rainbow CAL25 titan tweeters for sale, check the Classifieds if you're interested. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif They'll blow the PG RSD tweets out of the water.
Mine blew in 2 days with 65 unclipped watts. They also were so bright and sharp sounding i'm glad they blew sounded like crap anyway.I replaced mine with some diamond/eton ones from back when they were still german I could not be happier now.
Distortion or a "dirty" signal is the biggest killer to a speaker.
I'm not saying that your install has anything to do w/it, just pointing out a justified fact.