I adjusted the eccentric push rod bolt to where I feel the most play in the clutch pedal. It seems like shifting has improved slightly while driving the car, but the problem at full clutch-pedal-in still exists, causing poor drivability. It's difficult to get into gear from neutral while the car is stopped.

It's possible I messed up the new slave cylinder before installing it, as I pulled its pushrod out to compare with the original one. The pushrod isn't installed backwards but it might not be seated correctly, so I'll order an FTE slave cylinder just to rule that out. The new ATE clutch slave cylinder I installed came with the car so who knows where it's been.

Before installing the FTE clutch master cylinder, I installed an Exedy clutch master and re-used the pushrod original to the car. Having the same clutch problem and thinking the pushrod/M.C. combination wasn't correct, I ordered the FTE which includes a supposed W123 and W126 push rod.