They would have to skim a shed load off to cause these issues.
The CAS is worth checking/swapping and I would re-time it from scratch.
I had a bitch of a time with my Stagea with power maxing out around 220rwkw. Timing belt was originally changed by the compliance workshop. Out of sheer desperation I had the car re-timed from scratch (despite being told that it was fine) following a similar issue that Guilt Toy had with his R33. I have no idea whether the timing can appear correct at the top but be out at the bottom but the car makes the power it should now and takes the timing at peak torque and up top like a neo should. It is more sensitive at peak torque and likes more fuel there than my R33 but Trent would be all over that anyway.