If your 'Burb pullls your current tt (~5k lbs) fine in regards to accelerating (onto the e-way, away from stop lights/signs), I don't see any reason you would want to go with the lighter trailer that is smaller. Even the 22' is lighter than your current trailer, so acceleration, grade, etc should be a breeze with the low profile.
With that said, yes, there will be a slight noticable difference in regards to accelerating, or pulling grades, but not a huge difference. Pulling my 16' ta utuility trailer (about 1300lbs) empty or with the mower on (about 1300lbs) there is a slight difference in acceleration as I mentioned above, but not like when I load the trailer up with 2yds of dirt (about 5k lbs depending on how wet). Once rolling very little noticable difference as mentioned.