Isn't 1 mil of fork adjustment roughly equal to 5 mil of rear ride height? I wouldn't go more than 2 mil to start. Then you're at the point of worrying about swingarm angle.
No, not with the front forks.
There is some math involved in the shimming and dog bone links on the rear.
For instance, if the holes in the links are 1/4" closer center to center, the rear
end of the bike will raise much more than that. Depending on the geometry of
the shock, link, & swingarm setup. Doing these will change your swingarm
angle slightly.
Again. Your best bet is to raise the fork tubes. Make it simple. Plus you will
be lowering the centerof gravity slightly (which I like).
FWIW, I run my forks up in the trees 4-5mm with 190/55's and 6-8mm with
180/55's. My personal preferance.
180/55's are taller (and cheaper) than 190/50's BTW