I posted a reply about your transition having an extension in it then deleted the post thinking I could be wrong., However after reading the whole thread again I have decided to post my comments again because you take your skiing seriously and are making steady progress. But more importantly if there is an extension you will need to correct it sooner rather than later as it will compromise your skiing.
First, let me say I would have liked to have seen more video.
While I see a little flexion at the start of your release in your latest footage it appears to me that you follow this with extension of the inside leg to complete the release. I am not referring to the movement of the hips through transition.
I say this because the inside leg, timing wise, extends earlier than I would expect to it see it and this corresponds to your hips moving across the skis. Further, when I look at your tipping it appears late and this is what I would expect to see with an extension of the inside leg in the reslease. If there is an extension the tipping will always be deficient in both the timing and amount of tipping you can achieve.
I note that Max501 agrees there is flexion however I think he is also inferring there could be a extension of the new stance leg too early in the new turn as opposed to what I think may be happening which is the extension is part of the release.
In my view, if you are truly committed to you stance leg at transion a small flex would be enough to fully release. If you are not fully loaded on the stance leg you might have an extension creeping in to complete the release or it could be residual from earlier.
You need to satisfy yourself you have a true flex to release as it is critical to your developement.
Exaggerate flexion; try increasing your stance leg flexion at transition until both knees are equally flexed, and only extending the new stance leg once the release is complete and only to keep snow contact. Ie no push, and keep your stance narrow.
In Pmts skiing you want to lead with inside foot tipping but any extension will block this.
On this last point, I have just seen Diana Rogers eVideo on the Harb website "drbrushcarve", and only $10, if you have not seen this I recommend it to you and suggest that you praxtice the progressive tipping and control of stance foot engagement, confirm with video, it is a must for all PMTS practitioners and extremely well done. It will help with every essential movement in your skiing.