I agree, the master cylinder pressure is a global shift better. I have it in my F350
There is another option now though if you cannot or do not want to tie into the master cylinder.
DirectLink These guys
Direct Link by TusonMy son bought one for his 2500 Avalanche when he bought his TT. It plugs in the OBDII port. I was shocked at how smooth and simple that controller is. And it gives you other reads outs.
That is an "option" to give you the performance you are after if you want to mimic the OEM master cylinder type systems.
They are about $330 bucks. So far it has shown to be a really good controller.
Hope this helps
John