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I’d suggest some vocal fry and some coup de glotte style exercises (using an onset that’s somewhere between balanced and glottal), if you feel confident using these. That onset is really important as it might help get the interarytenoids going, (a weakness in interarytenoids is usually what causes posterior chink. Often what’s going on is that the lateral cricoarytenoids are doing their job but the IAs aren’t). As Matt suggests, some lower pitch, thick folds exercises will help too.
