expected behavior nigyrob,
as the poster before mentioned, backspin gives you a little more carry and a little less roll out. Use it when you have a bunker or such you are trying to carry, and need a bit more carry distance.
When you need no extra carry, topspin can get you a little more roll out and a little extra distance, especially with a heavy tail wind. Caution though, I have seen some times where full top spin sends the meter across the screen faster than anything I've ever seen, lol. if ya ding it, you'll get the extra yardage, if not - all bets are off.
your clubs might not have as drastic affect on the meter, and also may bot yield as drastic of results with full b/s or t/s, but it is a good thing to practice for down the road.