I hear you... my winter rides are shorter but I do still enjoy them... especially on a crisp sunny day. Wind protection is key.When I stated 3-5 , I have mine set on 1-5, not 1-9. I'm on 5 for 80% of my riding. Also, I don't do winter riding. Never could see the fun in that.
And having PAS set to 1 - 5 when you have the ability to have 9 doesn't change the fact that you are leaving possibilities unused.
Simple seems to work for you, probably best to leave it so.