From this pic it looks like the MC is ~3" shorter that the b6 you removed, about the same as a b8 insert would shorten the strut
If so, that changes the raised spindle calculation, because it places the stock spindle and steering in the same place on a 3" lowered 911 as the stock b6 would place them at stock ride height.
i.e. raised spindle isn't necessary
the relation goes like this
shorten the strut 1" is the same as raising the spindle and steering 1'