Dont forget your compression adjuster and rebound adjuster purely effect an orifice. So if you can feel 2 clicks change, you can feel a thicker or thinner viscosity much the same.
However Grayracer is very correct it has less effect with the shims.
As to feeling stiffer, when doing purely seals on a TC fork, you don't mess with any of the valving. you dont even have to open the inner chamber and change its fluid to do just seals.
Maybe your imagining its stiffer, or it's not installed correctly, or the 5 clicks stiffer is making it 5 clicks stiffer.
But dont bash the guy because you think he messed something up. It would be very hard to mess anything up doing purely fork seals....
I'm not trying to bash him I just was wondering what he did...and what oil he used. Because the suspension is noticeable stiffer now. I'll let you know for sure how things really are once I ride it again this weekend.