If you want AM only, which is what a Cobra 29 offers, then go with either a Connex or a General Lee / General Washington. No need for the RFX75 add on because you'll be running an external amp.
Also, many Connex rigs already come with the legendary Connex echo board already installed.
I myself prefer the Cobra 29 LTD when PROPERLY modified. You can either add the RFX75, or a Stinger Board, or an external amplifier. If you set up the 29's just right, low dead key and high forward swing, and you run them against a low-drive amplifier into a properly matched antenna with the RIGHT microphone (i.e.: D104, 575M6, etc.), you'll have PLENTY of AUDIO (just no echo.) An internal echo board (or as suggested: a 2018 Extreme Echo Mic) might give your audio that: PRESENCE you seem to have noticed with some of the Galaxy's, no doubt running echo.
I'm not exactly sure WHAT it is about the Cobra 29 chassis, some say it's the audio transformer and/or audio chip that make them so LOUD as compared to the Galaxy chassis which is a more "transistorized" sounding audio. I'm pretty sure that the audio fidelity and frequency response of the audio chain in the 29's has yet to be rivaled. The only radios which seemed to offer as much frequency response were TUBE rigs: (i.e.: old Brownings, Trams, Regency's, Colts, Gemtronics).
Sounds like the ONLY audio mod made to your current Cobra 29 is a clipped D11. (Don't let DTB see that, hihi.....) If that's the case, you really aren't coming close to taking full advantage of what a Cobra 29 has to offer. You need to have some capacitor mods performed; ideally ones that take into account the type of microphone you are using and YOUR OWN particular voice. Once you set up a Cobra 29 to YOUR voice, or even if you can get your hands on a 575M6 mobile or 1104C desk mic with tone control, I'm pretty sure you'll be quite pleased with a 29.
The TRUCKERS seem to like the Exports, only because the CB shops seem to be pushing them (more profit???). BUT.... if you go to Channel 6, or Channel 11, or Channel 26 and ask the LOUDEST stations what THEY are driving their (often) exotic amp setups with, by-and-large, you will find that the LOUDMOUTH radio of choice is the venerable Cobra 29.