DV+ that is working properly should not alter performance at WOT, it should only alter the dynamic behavior during shifting. If your valve is leaking internally or externally it could affect the WOT performance.
To get the right behavior the springs need to be installed properly, the o-rings need to be good, the piston needs to be oiled and "perfect", and all 3 of the fasteners need to be properly installed. That bottom screw is difficult to tighten properly, it is fairly easy to cross thread the screws, the o rings are easily damaged and the springs easily fall out of position during installation.
My original OEM valve was sticky and replaced under warranty. Even though I had no problems with the replacement, that experience made me nervous and I installed the DV+ as "insurance". I have not had any hint of problems with it.
When my OEM valve would stick I was using sustained full throttle and then suddenly dropped to 0 throttle (maybe I needed to brake too, I forget now). Sustained full throttle (no shifts) on the street is not a common occurrence unless you are driving at go-directly-to-jail speeds, in my case it was up a steep hill at more than 5000 foot elevation, where 40MPH to some undisclosed speed takes 10-15 seconds.
