I recently started a custom character build with Athletics as Minior Skill. As it was my first playthrough of Morrowind and I wanted to explore, run and swim, I quickly found out that my Breton Mage raised Athletics to fast and forced me to level up to early.
I restarted and changed Athletics to Misc Skill – it still climbs up pretty fast but at least doesn't force level up.

There is a Console Command to SetValues and I thought to reduce the value for Athletic after each level up, so the progress would not be that big. So I could use the bonus for a Speed leveling if needed and then just reduce Athletics by 2 every time before I start to level again.

If I start doing this what negative side effect could there be? I'm new to Morrowing and don't want to break the save-game by playing with some game algorythm or screwing up the leveling system.

Thanks.