I made the i190 bodypiece hq last night. With all hq mats (my alchemist friend got lucky at 42% and got me some hq luminous fibers ), I had like 5000 initial quality, which made it really easy to hit 100%. My normal three star rotation worked just as well on this as it did the other things. Compared to my pentamelded i170 weaver chestpiece, the stats were roughly the same, with only minor of a few points (with the i190 unmelded so far), so it's definitely waaaaay better than i170.

Oh, the 3 hq luminous fibers alone gave me like 1200 or 1800 quality I think, I forget the exact amount but that should be roughly how much you get from the 3 hq fibers.