Surely the relationship at its simplest, unless about a specific type, is just that the dirtier the airframe, the lower the manoeuvring speed?
i.e. the more the wheels or flaps are hanging out in the breeze the less latitude you get with speed. Because of drag loadings on your dangly bits.
Funny how airframe tweaks that help you fly slower don't help you fly faster at the same time.
That's life I suppose...