I think you should work a bit on increase the drivability.
Last cars of yours seems pretty low on that side… I think you should be able to hit 40.0 drivability, especially on the 1966 Siena. It also have double wishbone on rear.
Maybe it is not 100% comparable, but take a look to the Z212 Urbana (the black one).
With McPharson (F) and Coil Live Axle (R) I was able to get close to 42 drivability.