My opinion on changes for him
Wall - Fair enough, maybe make it a little longer as well
Flash - I would aim for making the flash a little faster instead of more powerful, or else he'd be more of an initiator rather than a duelist
Molly - Maybe increase the amount of health it heals him, because honestly the molly only heals him 60 which is only an extra shot or two that he survives, also maybe increase the aoe.
Ultimate - Honestly the Ultimate is the only part of his kit that works well, it's not overshadowed by any other abilites/ults (like his default abilities are) and it's still so scary to face it as an opponent and he gets like every few rounds.