Confirmation of Motion Ratio

Hello, I'm making my way through the Suspension course and enjoying it lots. I have an old British sports car from the '70's, with a few track days completed I'm looking to make some handling improvements.

I'm having trouble being confident with the rear motion ration that I have calculated.... well.... calculated is a bit of an overstatement, as it's [1]!!! (Maybe a little less, if you take into consideration the 9 degree angle of the coil over. The arrangement is a simple double wishbone independent set up, but the design has the shock attaching to the hub carrier, so the shock has the same displacement as the wheel, so a 1:1 ratio.