I'm working on locating someone in Denver area who I would recommend.
If you're heating up 4" or other midrange speakers to the point of smelling the coils you're doing something very wrong. I've run nearly 100W RMS per side to 4" mids and tweeters on passive crossovers. I installed the mids on the door panels to play into a small cavity that was lightly filled with a 3M acoustic insulation product that resembles cotton batting. They were getting no bass, so even under heavy use they were never stressed to the point of heating up excessively or moving like the cones wanted to jump out.
If this unsolicited advice is unwelcome I will stop. I'm just trying to help.