Pre-pandemic, a group of Windsor Flying Club members based at CYQG made an annual excursion to the Bahama Islands from Canada. Our experience with the U.S. controllers is that the further south you go the more trouble the controllers have with our Canadian call signs: more letters than they are used to. We fly VFR and use flight following.
On one occasion, I was handed off to Jacksonville, which was very busy at the time. I waited for a brief break in the chatter and dutifully dropped in my call sign, Charlie Golf Charlie Alpha Golf and waited. Moments later at the next break came my response from the controller, “would the alphabet soup out there say again.”