i'm mostly clear creek bound, keeping myself in my comfort range until the skills rebound (well that and develop way more than they ever were!).
blue water makes good ropes, you probably chose a suitable rope for your needs. hanging out on the rocks/ice for fun, hanging in trees with sharp objects for work, & now hanging off stacks & towers 100s of feet off the deck, i've never bargain shopped for ropes or safety equipment, but rather bought what i need from a reputable manufacturer who back their gear & labels it.
couple minor items to keep in mind... size your prussic cord accordingly. think it needs to be roughly 1/2 the diameter of the rope it is to grab in order for it to actually grab (verify that factor though)
as your setting up your z-drag, toss a pfd, drybag, or anything easily available over the working end of the rope. that way if it snaps, that item dissipates the energy & can save you or others additional injury.
you can save yourself an anchor sling (simpler is always better) by wrapping the end of rope around a tree (2-3 times dependent upon diameter & bark roughness) & if there is a figure 8 on the rope end clipping it to the line going out.
damn i really need to get out there and practice this again. it's possible to get from deployment to actually pulling on the drag in under a minute... can be a fun competitive game while hanging around camp with your paddling buds.
i'm not certain why the melting point factor is a consideration. if you're paying out rope with a friction device at a rate fast enough to approach melting point, think a rework of the setup is in order. without a friction device, your hands would burn so bad you couldn't use them well before the rope starts to heat up.
more a factor is stretch, hence the semi-static or static recommendations, and a sufficient braiding pattern to keep the rope intact & not having strands pulled out. under high enough strains the cross section of the rope can "collapse", "square out" & get out of round, which can reek havoc on the gripping ability of the prussic.
sorry, hope i'm not rambling