Saw my name mentioned. Just to clarify I have found the the uprev does improve the bogging down issue. It was something I was always aware of, especially when concentrating when I had another zed member in the car. Get it wrong the the revs drop and the car falls flat on its arse,more it felt like that. It's noticeably smoother now and I don't get that drop so often, but it's not eliminated.
The uprev definitely helped past the 5k rev band. Before I simply got noise and not a lot more as I felt the car hit a plateau. Not a pleasant noise either just straining. Now she just keeps on pulling and it's far more fun. The uprev just improves the torque and you get consistent pull all the way through the gears. It's not a life changing, throw you in the back of your seat, holy cow change but it's a lot nicer drive now and feels smoother and quicker.
If anyone is around surrey or will be in wales and wants a trip to see the difference I'm happy to help.