Been at it on the 10" for quite a while now (maybe 40-50 flights already) and it is quite a process…
Big shout out to UAV Tech - one of the only source of sparse info about getting those big birds to fly properly. The Chris Rosser tuning method really breaks down above 7" (mostly as the default BF filters and pid balance are optimized around 5" quads so way off for big - or small’ ones) and there are loads of concepts to grasp to make sense of it all.
If only he did put this video out a few weeks ago - would have saved me a motor and action cam - as well as quite a few scary moments 
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Hi @Cedric
Just started the same process and lost my first prop last week.
I had lots of vibration and noise then a prop destroyed itself. They did feel a bit cheap to be honest so i ordered some 10" HQprops to try. Next step is tuning.
I have a quick question you may be able to help me with.
I have got 20 new li-ion cells 2700mah 18650 for free an was unsure if i should make a 5s or 6s pack with them. Or 2 x smaller 5s packs. I only intend to do cinematic flying and nothing crazy 
Cheers for all you previous help
Very useful info and explains my grinding noise
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Best is to test tbh - you can ‘simulate’ running on 5S Liion by running a motor limit on a 6S Lipo (15% for the missing cell and around 10% for the Lipo->Liion to be safe) - and then add the extra weight to get a feel for the quad in those conditions - it will likely feel very sluggish 
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First you need to get it to fly properly though - those tests can only be done after that
My advice is to start with i-term on around .8, d-term on around 1.2 and see from there. Short flghts to test motor temparatures - aim is to reach 100% throttle so you can analyse/test your filtering. Then slowly incrementing master slider until motors get too hot or weird motor noises (thrilling).
Then from timid stick mvts slowly increasing speed/deflection and look out for oscillation/bounce back - then watch loads of videos about analysing blackbox logs 
Once again thanks for the advise.
I have a 1300mah 6s that i have used for testing and have managed to get it to a point where the motors are not getting hot.
The quad appears to fly sort of ok in acro but as soon as i put it into angle it wants to head off to the moon.
I assume testing should be done in angle and i am convinced i had a shit prop so may just start over
This is odd tbh - angle mode can be used for some of the fine tuning steps (see ‘basement tuning’ method) - but should not change the tune characteristics per say compare to acro.
I suppose your gyro calibration is good if it flies acro ok - how are your pid gains?
Ill screen shot them when i get home this evening.
Enjoying the leaning prosess if im honest
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At last reaching a point where I can just have some fun flying the thing - took a while but learned a lot so hoping the upcoming 13" will not be as difficult to get my head around 
Action cam is very close to the front prop tips and wind noise is quite bad but I wanted to share the prop sound - the low pitch is intoxicating (sounds the same in real life ) - sound is a bit muffled as I did put a low pass filter to limit the wind noise.
I should now just need some minor tweaks if I decide to try new props or batteries… pretty sure I did see a Bonka 8S that would be a perfect fit and add quite a kick (those motors are ‘only’ 925kv for 6S) 
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Impressive is that. Looks so smooth.
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