I just want to note that my best luck with these fish has been with Thaliak Caimans. I can normally catch ~3 HQ in a window. (Best window was 6 HQ.) Basically, you pop Patience at the very beginning of the window and again at the start of the last hour. You'll be using a Bladed Steel Jig and then the first catch is with Precision Hookset followed by Powerful Hookset for the Thaliak Caiman. Precision Hookset will catch both of your mooches, Sweetfish & Bullfrog, and then the dud, Philosopher's Stone.
As for loot, I tend to get more HQ Seaborne Aethersand than NQ and I'd put the return on any Seaborne Aethersand from them around 60-70%, assuming you get an 8/8.
