Justin, that's a great idea I hadn't considered. Unfortunately, my only other customs, Livewire T1s, also has a fit/seal issue. Fought those less as they were prototypes and 1/7th the price. We recast twice then with the same result. So three casts by two audiologists (well not so sure the Livewire casts were done by a licensed doc - we twice met in a restaurant parking lot) for two IEMs have resulted in initial loose left sides. Maybe just something with my smallish ears? Maybe I'm a freak? To the JHA and recent audiologists credit, the JH13 fit was better than either Livewire though. Not sure how you increase IEMs one channel or decrease the other, but I hope it's a simple canal area extension or similar. As I've heard the same pair of JH13s in at least three different states now (original which I almost didn't fix, two painful, but balanced versions, and recent), I'm surprised there isn't more discrepancy in reviews. Maybe a great sign of the majoritys experiences with them.