Okay, after fooling with this for a few days now, I'm having no luck at all. I've got the three packs, with one empty behind the inventory window to maintain the shading, I've got the chum bait, I've got all that - my screen looks almost identical to the OP screenshot (except I'm a Rodian

).
Everything works fine until I catch a fish, then either of two things happen:
1) I lose my bait (most frequent problem)
or
2) I catch a fish, and about the time I get past the stupid "Your catch is noble..." etc., it runs me backward and starts fishing again.
Over the period of about two hours, I've caught one fish successfully. The only place I've been able to get this to work is on Endor at the Ewok villages on the docks (so I don't run forward or back).
Can anyone who's got this to work please tell me if I'm missing something? I'm sure it works fine or it wouldn't have gotten Yay'd, so it has to be something on my end - I just can't for the life of me figure out what it is.
Edit: Let me add that before, it was running me forward into the water and making me swim, therefore causing me to stop fishing - now it's the opposite. Grr!