Around 3800RPM is when it felt like the cams were starting to do work and change differently in power delivery over stock cams.
However, I came from BC Stage 2 cams when I installed those cams for a short jaunt. I ran those cams for less than a year and they were great until about 6800 RPM, then the power just fell off. (this was the main reason I went back to BC Stage 2 cams).
Those S3 were great for traffic driving and there are many a time where I wish I had that down low power they created for me since that is 99% all I do with my car. Unfortunately I would rather live my daily driving life in the upper RPM and I swapped back to the BC Stage 2 cams after they were in a turbo engine for a little bit.
The idle was odd, my Dad did not like the idle when I thought he would (since the larger cam with a goofy idle I thought was his thing) like the lopey idle they have.
My BC stage 2 cams make peak power at 7100RPM and they did not fall of nearly as fast as the JWT FELT like they fell off.
The above picture actually directly confirms what I believed the car was making power and up to the point it was making power and falling off. So I am not that crazy, even though I don't own a VE.