In response to one of your earlier posts about the enchant for the rod, i think it maybe the Reel that you can get, cant remember the name of it, but i've seen something about it, i think it adds +25 or something similar.
Other than that i'd like to say Well done for having the Focus to do such a tedious task, i mean personally, i think fishing is one of, if not THE best moneymaking trade in the game, but usually i cannot find myself doing any more than 30 mins to one hour per go.
Also, another place i've noted to catch Stonescale is on the Eastern side of STV, where Gorelash (47 Elite) spawns, and there maybe some just off the island to the East to with the Level 50 Elite King Kong wannabe.