At the London seminar coach had mentioned that the proper full ROM on the Xiaopengs is to keep the arm rotated forward with the thumb towards the ground instead of the palm down for the portion of the movement where the arm is behind the back.
After the seminar my Xeopeng as per the form in the video was feeling quite strong, but I needed to decrease the weight a bit to do the motion in the way coached described. It took a bit of work but eventually the X-forward was feeling strong and I've recently moved onto X-backwards with the increased ROM. But recently I've had a bit of pain in the top front of my right shoulder that seems to come up only with the forward roll of the shoulder that is required to turn the thumb towards the ground. Today I went through my entire F1/H1 workout without any shoulder pain , including X-backwards with palm down as per the F1 video form without any pain. It's only when I turn into the that slightly increased ROM that I feel a bit of impingement in my right shoulder.
I'm wondering how I should proceed with this iM, should I just continue with the form as per the video and increase the ROM later? Is the additional ROM something that might come up in F3/4? Essentially I'm not sure if this is something that will just sort itself out as I progress through my normal Foundation workouts or if it's something I should put in extra work to sort out now (though I'm not entirely clear on what sort of extra work would be required).