There are multiple videos by NextLevel and Brett Clarke to explain the whip and what is optimal and what is not ... I will try to find some for you when I can ... may be sooner than later ....
the key thing in any table tennis stroke is to keep the tension in your core, which helps in getting power from a more stable source , and then also prevents too much follow through that might cause imbalance ...
one thing about european and chinese style that I would like to mention here is really there is no two different styles , its more a collaborative efffort that has helped in evolving the technique as we now by efforts on both sides of the aisles ... I don't want to go into too much details ... there are threads on this very forum explaining that evolution ...
on any stroke your elbow should ideally be at a natural level , hanging from your shoulder ... it can be closer to the body it can be farther from the body but the key is that you should not be pulling the shoulder up to adjust to an incoming ball ...
somebody , I think most likely Larry Hodges said, if after a training session on table tennis anything other than your legs are sore , you must be doing something wrong ... keep that in mind ,its an excellent thumb rule indicator to know if there is any correction technique necessary ...
Much thanks for taking the effort to post a video. I can see my elbow is much higher than your shadow stroke. ttmonsters tip of relaxation could be a key. Is there a difference in elbow height in comparing the European style forehand vs the Chinese style? If I straighten my arm somewhat for whip in the backswing then the elbow is higher than a bent arm stroke??? Shadow swings coming...