That's normal during the colony rush, and normal for the duration of the game for some people.  But as you become more used to everything, you'll get better enough that you probably won't need to every single turn.

Actually both are normal in this type of game - fiddling with sliders every turn, or hardly at all.  I suppose in the end it's all in how you want to play the game.

Unless you are asking if you SHOULD be adjusting the sliders every turn.  But even then it's up to how you want to play the game.  I think it took many of us more than a few games before we got comfortable with how and how often we used the sliders.

Before any of us can give a more detailed reply to such a question, we'd need a lot of info, from your difficulty setting, game version, your map settings, and your objective in the game (i.e. how you want to "win"), etc.