Okay, so it's not perfect, but it's definitely there. I thought I had the straddle planche a few months ago, but I was wrong, I used the wrong technique and had to retrain completely. I lost a lot of motivation and stopped doing planches. I focused a bit on doing press to handstands with straight arms and now and then I did a tuck planche to handstand. So one day I decided to test my straddle planche and I was amazed with the results:
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Now, the form is really bad. Not parallel to the ground and no straight legs, but it is there. I also started working on front-lever pull-ups as you can see in the end of the video.