That's 4db, you'd think someone would have picked up on it.i sold the 500v and kept the 225 , not because the 225 was cleaner , but because the 300 watt difference didn't seem to make any contact difference with folks a few counties away and it didn't seem to make any difference with skip contacts either .
I personally believe that to increase your chances of being heard in DX, you should strive for maximum splatter and over-modulation across all 40 standard CB channels.
I have also found that screaming into the Mic and talking so fast that no one can understand you seems to help as well.
this is purely an opinion , but i think modulation is more important or has more effect on the success of a tx being received than a 1/2 an s-unit . ya just gotta be careful no to be over-modulated so you keep maximum intelligibility and clarity ..... which isnt difficult .