Very often, a good aggressive razor or setting and good blade angle is much less irritating than a milder razor with more passes. Glad you found what works well for you!
I generally prefer between 7-5 settings on my Slim as well.
When I got my Slim I approached it in reverse to most of what I read: Loaded up a Gillette Platinum and cranked it open to 9 to see how it would go - Beautiful shave!

I will admit that I became overconfident immediately after that and removed some skin from my jaw and part of a scar on my scalp somewhere along the next few shaves.

Now, after some experimentation, I usually start wide open at 9, then go XTG & ATG at 7.
The greatest part of it is that if I notice that my first few strokes are uncomfortable, I can adjust it until it is!
