Here is my latest straddle planche:
What I noticed myself is that my lower back is arched, but then I did some research. I see that a lot of people have an arched back in the lower back. Couldn't actually find one without an arched back. So I was wondering if my form is good apart from my legs being too low.
Then there is my max advanced tuck planche hold, which is strangely enough around 10s only.
I know I've posted a lot of things related to planche, but this move is seriously incredibly hard. No matter how hard I train, I never seem to get it right. I've achieved other moves like the OABL 10s, without even training for it and I train the planche almost always and I still don't progress that well.