Yup, that is normal. One should never adjust the main pill to change the idle, but changing the main pill WILL raise and lower system pressure a little bit at idle and cause a change to the leakdown percentage required.
Generally, if you're over .100 on the main pill, a .005 step won't require a tweak to the hex-link. But two or three .005 steps will need an adjustment...usually just a flat or two.
When the main pill gets LARGER, idle fuel pressure will drop a little and make the idle a little lean.
Spud