Hmm, yes, but I really want to be sure, that if I change xx ohm to yy then there is best result for more solid voltage, best would be if there is a little bit more voltage at full load than idle or the same And maybe there is a bad side effect if I change resistance to wrong value.

Maybe author of his vdrop mod or some one else can say exact measurements what they set? And I think you should always use multimeter when doing some hard mods