From the video, it seemed your saddle was half an inch or an inch too low. You could relax your arms a bit more.

Although pro racers have all sorts of scientific methods to judge whether the saddle should be moved closer to the stem or further from the stem, many simply place the saddle where it is most comfortable for their style of riding. Greg LeMond often had his saddles pushed as far back as they could go, and many sprinters have their saddles pushed forward.

I would put the saddle at the "dead middle" of its rails, and raise the saddle one inch. Then ride for a week or so. At that point, if I felt too stretched out, I'd move the saddle forward. If I felt too bunched up, I would move the saddle back.

Setting the saddle position by "comfort" is the sensible thing for recreational cyclists to do. But, many "Lance A-Likes" prefer to use some "scientific formula", no matter how painful the results.