Don't want to make this a long post, so I will keep it short.
When in to awesome today for a haldex service and stage 1 low torque map. They took the car out pre map to do logs to make sure all OK. Came back and said that the car had timing pull of up to 5 degrees and questioned if I was using 99 Ron fuel, which I was. They said it could be the standard map from factory that could be the issue. So they flashed the 98 Ron stage 1 file, back out for more logs and 0 degrees timing pull across the rev range. Just goes to show that factory or standard isn't always best.
Cars a 2017 plate mk7 Estate, no time for dyno figures so no before and after. Night and day difference as you can guess though. 👍
Incidentally, cars oil is cooler now as well by 8 degrees C, not sure why as of yet?