First off good job with the assisted VC's! You sound like you're pretty diligent on form (retracted scaps, locked out elbows??) um, my experience is different because I train them kind of opposite of you apparently
in Maltese, particularly BL=>Maltese, I tend to externally rotate my wrists so that my pisiform (think that's what it's called) is in full contact with the rings and pressing pretty hard. I feel like this gives me a slight mechanical advantage...
In Victorian I have recently decided to focus more on pressing backwards with my posterior delts and outwardly, kind of like what you suggested. With my wrists though, I use a normal grip and once again bring the rings into contact with my hands at the pisiform mainly. As a side note, when I do VC stuff, I always internally rotate my humerus pretty hardcore and my elbows face in towards my body (opposite of Danny who has his elbows pointing out and across his body) . the way I'm trying to do it makes it way harder i think but seems to make more sense with locked elbows idk...