Yep, that's your only adjust point unless somebody has gone and replaced the slave cylinder actuator rod with an adjustable one.

Sounds easy enough. I just had a hard time believing it was that simple. Hopefully what feels like slippage is just the clutch not fully engaging, and not a sign of a poor quality plate. I could afford the kit and a few hours in the shop - but I can't afford to redo it.

Happy to say that moving the pedal stopper back appears to have done the trick.

If you have problems with the clutch not engaging with new parts installed, give this a read too: Nissan Throwout Bearing Collar Specs Comparison Measurements

There are about a zillion combos of throwout bearing collars and pressure plates. As long as the whole stack adds up the right thickness everything will be fine, but if you have a tall pressure plate and a tall throwing bearing carrier, then the distance will be wrong and it'll rub on the pressure plate and prevent the clutch from fully engaging. If you have a short pressure plate and a short throwout carrier then it won't reach far enough and it'll never disengage properly. I've heard it can be a real headache if you mix and match different years or different models of transmission and don't keep the matching parts together.

Hopefully you don't have that issue, but it's something to be aware of if you keep having problems.