As a California hiker, I'm gonna say, stick with the pad. Get something together to give the neoair wings to use in the hammock, or go with a 3/4 length UQ plus the neoair under your legs, and go for it.
PCT is not something you want to be without options for. Folks who don't hike much over 10,000 feet don't get it. If you are in the treeless reaches and your knee starts to pitch a fit, you want to stop, but it's nine more miles to treeline? sucks. Don't get me wrong, UQ are the greatest thing for comfort, but if you are not going to be one of those hikers who knows they can for sure get that extra 10 miles to trees, it might be better to play it safe. Not to mention all that desert hiking at the start of the PCT - can't hang from joshua trees!
Take 8-10 foot tree huggers. That will give you more hanging opportunities.
The tarp issue - you might be one of those who prefers hanging closer to the ground? I personally prefer a tarp to be way above the hammock! gives me room to stand up in. But for what you're doing, I would think about how the tarp might be pitched in a ground configuration as well. I have no experience with the superfly or how big it is.
I use a JRB top quilt all the time, on the ground, in the hammock - wonderful quilt. I gave up sleeping bags before I started to hammock and haven't regretted it.