The radio is a technological wonder... given that, AM, and especially AM in the FCC 40 Citizen's band, is not its intended forte.
I have spend countless hours and $$$ figuring out that "(Insert big-dollar whiz-bang ham radio make and model here) sure LOOKS good, " they fail to perform to how you think they should sound on CB.
Maybe not what you are shooting for here, but only mentioning this to others to save them a ton of headache, heartache and wallet-lightening.
You want CB that sounds good on AM? Buy a CB that sounds good on AM.
From my readings and listenings, the current state of the HAM art is being done in what is generously called eSSB. That's kind of where my experimental yearnings are right now. I have a 'loud' CB and it is a Uniden brand, model is Grant XL.