Miniquad speed record. Part 7. V2 maiden and fail

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I'm experimenting with different multicopters for years and would say that I gained a good bit of knowledge, but I'm just stuck on this one:( What can cause this? Frame's flexibility is outruled as I thought it was the problem with V1, inverted motors apparently outruled as well, different PIDs change nothing... Anybody has any ideas? PLZ:)
OK, before any suggestions here's what I'll try next in order:
1. Have some beer to cheer myself up a bit after failing.
2. Replace clogging motor. Even when it runs OK after dodgy start.
3. Look into ESCs or until I have a smooth start on all.
4. Switch off Oneshot and breaking.
5. Cleanflight instead of Baseflight.
6. Boris' Betaflight.
7. Have more beer.
If none of the above will eliminate my problem (excluding the beer of course, it only helps troubleshooting:), than I'll start blaming large surfaces beside prop tips that messes up my yaw...
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