I think there is definitely a cultural difference between the US and every other country with horse sports. Here in the States we have our strengths and weaknesses, as do all countries. We definitely tend to be less aggressive and softer in our ride, which I think comes from the hunter/equitation foundation so many of us get. It took me YEARS to learn how to gallop in the jumper ring when I started doing that, and even longer to learn how to actually sit my solid little WB to the jumps (which is what he prefers), and not do a nice, light, pretty half-seat constantly! 
I have known a few people from Latin America and to a person their riding style tends to be more forward and aggressive, and their horses reflect that in the way they go. Some horses and some riders do really well with that, and sometimes it starts to fall apart, especially when the jumps go up.
If you find it more fun to not be catapulting toward the jumps you should absolutely feel confident in telling that to your trainer and looking for a horse that suits you better. It sounds like you have been really successful with your little guy, so finding a good next home for him with someone who wants to win at the lower levels is a good idea and hopefully won’t be too difficult.