i am running 2" coil spacers up front, with a 2" strut spacer and no strut mount flip.
i do not bottom or top out, and when on level ground, the strut sits half way, which gives equal 4" of up and down travel.
my guess is, you do need more drop in the strut to stop it over extending. but maybe its a really worn out strut? does it bottom out on compressions?