I am using the ultra high quality setting in massive so I'm sure it's nothing to do with the quality of the sound. You can still make horrible sounds on ultra high so I think it's the way I'am making it.
I don't really know how I can show you bad examples but a good example of what I'm trying to achieve is like the lead sound in
https://www.youtube.com/watch?v=9NwZdxiLvGo this song at 0:55. That lead sound has an interesting high end. It's not just annoying buzzing.
The buzzing I'm talking about is similar to just making a super saw and not having any filters on it. The high end is really harsh. I'm constantly getting a really harsh high end that is not pleasant to listen to.