i had 2 perfects replaced direct from infinity cus i blew them. it was very odd how it all worked, but i have another blown one now and i think i might send it back. I love them but they just wont take that much power... well not if you arent really careful. and if you had your gains 3/4 that is wayy too high, you should be putting your gains at more like 1/4 to 1/2. Thats how i originally blew mine, only i didnt blow the VC, the cone separated from the spider.
Unless you are positive thats not what is wrong with yours i would check it out. on mine it looked like it was fine until i looked close up, its like a extra catching thing it does where if the glue comes off it is held on still by another thingy, i dont remember exactly what it looked like,it was like 3 months ago. But i could push the cone down, and have it "pop" back into place. I ended up getting some super glue and gluing it back cus it would keep popping back out of place before i glued it. ANd it made a really horrible loud popping noise thing when it was pushed too hard, but sounded perfect until that point.