No I don't know what you mean, you said AQ soft parts are garbage, so tell me how AQ soft parts are junk. Considering you don't even know that an HDC3 = 3" VC, so a 4" VC won't fit, I'm assuming you're just repeating what you read on forums instead of basing that statement off actual experience.
I run an AQ3500 @ .5ohm daily on an HDC3 aluminum coil with NO issues. Majority of AQ soft part issues are operator error plain and simple. If you're blowing **** up figure out why as there is no magical suspension/coil package out there that's idiot proof.
I've reconed a LOT of blown subs over the last 3-4 years and I can tell you that AQ is far from the top of the list...