I owned a T6 and currently own a T7. They are stiff, and can carve well especially though choppy snow.
If you can get it for a good price (under $500 brand new, or under $300 or so used) I'd go for one. I'm not familiar with the flow lineup but if you're into carving I'd try to get the stiffest bindings they make.
Another thing you can do if you're serious about the sport but don't want to get a massively long board is get one of the custom builders to make you something in the 165 range that's designed for your weight. Prior offers custom flex (stiffer) for their boards for $70 extra. Some builders build each board based on the riders weight.
I don't think you'd be unhappy with a T6...