Your bike is only three years old and it doesn't sit around. You've ridden it quite a bit. At that age and with that mileage your carb shouldn't
need service. However, I don't know what the general quality of gas is in Panama.
My takeaway from your opening post is that you have noticed a difference in the way the bike behaves and that it is a bit intermittent.
Using an additive in the fuel should clean things up but it may take time. It may also not treat an issue with the slide if that is the problem.
Given the age of your bike, I am going to assume that you've never had the carb off, so there shouldn't be any mis-assembly issues with it.
If it were my bike I would give the additive a tank or two to do its job, especially if there were no running issues other than throttle response. If it doesn't clear up then I'd rotate the carb so that I could remove the top cover and lift the spring out. Then I'd put my finger in the bore of the slide and gently test for its ability to slide up and down smoothly. I'd inspect the slide and its bore for crud, goo, varnish, evidence of sliding wear that has created burrs, and embedded grit. In short, anything that would inhibit it from sliding up and down freely. Have a look at the diaphragm as well.
Let us know what you find. I do have to note, based upon talking with scores of people who have worked on their own carburetors, that the biggest problem with them is that they do more harm putting it back together than they had when they took it apart. That's why I'm suggesting only a partial disassembly to the part most likely to create a cause and effect. Be very careful with the re-assembly of the slide and cover when you put it back together.