Anyway, I think I have found the solution!
There was no way to get my current meshes smoother than they were (or maybe there is, but I'm tired of trying), so i just started all over and just now I made a really basic hairpiece and it looks smooth! *yay*
I usually started with a 10x25 (or higher) NURBS sphere and just played along with it.
Right now I just started with a 8x8 NURBS sphere, detail level 2 on, made the basic shape and then rebuild it to 16x16, made some more adjustments/details and finally rebuild it to 45x45.
Then I did the delete history, freeze, etc thingy and exported it to SL and it looks great!
I'm not sure what it will do once I get to a more complicated shape (right now it's just the basic C-kinda shape)), but I am going to figure that out right away.
Conclusion at the moment:
- Detail level must be at 2 at all times
- Start really low poly for the basics and rebuild to somewhat higher-poly along the way for more details until I end up at 45x45
- Don't forget to delete history, freeze, etc.
- Really happy with the result within SL
I have tried out this new "method" and I can say that it works perfectly!
So, thanks for the additional information about deleting history, freezing/resetting information etc, my problem has been solved, and here's proof: