Wondering what mix you are breathing? Only He2 penetrates the watch under normal circumstances, when you opened the crown you let mix in at 188psi over ambient if the watch equalized. Don't know exactly how the DSSD He2 relief 'burps' but I suggest you leave the crown unscrewed during deco unless someone here is absolutely sure the He2 escape valve burps all gases.
A trick played on the newbies in chamber air bounce dive to 200+ was tell them their time was wrong, they were narc'ed somewhat and would usually comply and reset the watch; often their crystal would blow right off while surfacing. Certainly don't want that to happen to your DSSD!
Best,
A fellow diver
