I checked the TCU you linked. It shifts at the stock shift points unless its in manual mode. In manual mode it holds the gear until you command the shift or it hits the limiter. Our car has 2 limiters. The engine rev limiter (ECU) and transmission limiter. (TCU) Both have to be raised to take advantage of the added RPM's set on one or the other. I had a similar TCU once. (Evotech I believe) I wasted my money. Couldn't keep off the limiter because the shifts in manual mode were sooooo sloooow. Shifted normal when left to shift in drive.
I'm back to stock shift points. I will say that the power curve was still climbing at 6400 rpm and believe 6700 would produce 40hp over 6100, at the least.

Les