i've started doing the same zone/same pattern of opening chests and stopping after opening 5 chests regardless of thud/loud thud. ~ going to see how this continues but getting some decent crap so far.
I'v been doing the same thing. With both Mars and Venus actually. I've gotten a couple of loud thuds, but nothing better than high tier mission items and escha/reisenjima gear.
I also start with the chest second to the far back left, then open counter clockwise until I have 5+ opened or a loud thud.
The only time I change this pattern is when the chest o plenty spawns in one of those chests. Then I start with that chest specifically on the next run.