Currently jumping a lightly loaded Spectre with Dacron line; it opens like butter (takes about 800 feet though). As a rigger, I'm somewhat ashamed to say that I get consistent openings by having my master rigger boyfriend pack for me
Dacron lines are the hot tip for soft openings; they stretch to absorb a bit more of the opening shock.
No problems rear floating the PAC so far, and they dump a lot of tandems out of them. I could see the low tail being an issue in a stall situation, but other than that I think you'd have to try pretty hard to hit it.
I'm not the Lisa you're thinking about, btw. My last name is Briggs. Doubt you'd remember me, I didn't get to hang with the cool kids until a few years after you had to stop jumping.