From what I've read about dungeons best suited for farming plus eggs and the level of where I am at right now, I think the two dungeons that seem best for me is Mechdragon during plus drop bonuses and Star Treasure Thief's Den. While I am at this level, are these two dungeons the best to run while they're around? What about Starry View Lane? (Under the assumption that I do not have a 100% success rate for STTD while I do for Mechdragon.) Once I get around to being able to farm Mythical plus, should I choose that over the other three? Also, when exactly does STTD/SVL roll around in terms of days of the week and weeks of the month?