Free flow in the upper register is a lie that most companies tell. Free flow can even be had with a "stiff trumpet" as it is NOT the horn, rather your approach to playing upstairs. A lightweight trumpet will be more effective in fooling your brain into thinking that life is easier. Slightly more resistance from a professional horn means more efficiency and that means more sound for less work. Getting back to the issue: forget about a hardware solution to a software issue - unless you really like believing lies!