Forgot my previous post. I had another Go with pebble this evening.
What works good now 
- Header/Lifters are correct!
- I Can thee the header/lift analysis on my phone. I had to be in race mode
- Resetting the timer works
Bugs
- I have made 5 tacks (on my bicycle) but only one of them showed the analysis.
Most important things for me
- VMG +variance and cues (can be shown instead of time
- Header lifters / COG variances
