While I am not as loaded down quite as heavily as you often find yourself, I am packing around an extra 50lbs or so when working.
Anyone that is familiar with my posts will probably understand that I am a huge proponent of being well versed in SOTM. I attempt to try as many variables as I can and I do train a few different methods regularly. Like anything else, I will have my own preferences on what method to use for different situations and will have favorite or lesser favored methods situation dependent but I like to have the options. I have personally been using a movement technique for years that is nearly identical to the movement theory and technique that you see performed in the VTAC video.
When I am moving to my support side and do not have the ability, or afforded the opportunity to switch the rifle to a support side hold, I will reverse my movement from a forward roll to a backwards roll mid movement. I will only opt for this when I cannot drop my hips by bending my knees which allows me to rotate (tank turret) my upper body with enough rotation to be able to effectively engage my target without getting crossed up. One thing I really wish to avoid is having both feet not facing the direction of travel (side stepping). Side stepping may have a place, but for a sustained, fluid movement it does not provide for a stable shooting platform as it creates too much bounce. Having at least one foot inline with the direction of travel helps mitigate bounce and practice can all but eliminate it.
Having said that and just speaking about the angle at which you are traveling on your oblique movement in your video, I would use and advocate keeping a forward movement and dropping my hips with more bend at the knees and tank turreting to engage the target. Again I acknowledge that the added weight places a lot more pressure on the body, joints and muscles and prolonged use of a deeper knee bend may not make the turreting move as ideal over sustained movement, so yes there are factors involved. However, “ideally” I would not prefer to use your choice in movement method in that instance as seen in your video. I do understand that you are running a drill and training your movement but IMO you are far less fluid. Now if you were running a true parallel to the target and you are unable to get enough rotation to engage then I would do a complete turn around and move backwards in one fluid movement. I do this technique without breaking any contact on target and continue my normal rate of fire throughout the movement. This is definitely a more advanced move and attempting it weighted down without a high level of proficiency is asking for issues. Again we need to understand the situation in which it is applied and the overall need or practicality of the movement. The “have to do it” type of option. Yes it does get used sparingly but if I find myself in a situation where I have to do it, then I want to be able to do it at a high level of proficiency.
I will very often use a movement that generally contradicts the basic “heel to toe, both feet pointed in the direction of travel” concept where I keep my strong side foot headed in the direction I want to travel, but will use my support side foot pointed at the target for specific reasons. I will refrain from expounding further on this however but I will say that this foot movement might be more advanced than what would be taught at square one for a newer shooter and of course shooter experience and skill is always a variable. I will add that I “generally” prefer to cross my feet in the front as opposed to the rear as it is more stable, but in your video with your direction of travel crossing in the front may be more strenuous but I am still more stable and more accurate. Never say never, because I will use a rear crossing movement situation dependent and it becomes a pick and chose where I have weighed the pluses an minuses to the movement and what I need to accomplish.
I might suggest other methods for you to use but what works for some may not work for others. I will attempt to teach what I feel is a better method, but if it doesn’t work for someone, due to whatever limiting factor (disability, inability, weight of gear, etc, etc, etc,) then I will attempt to offer alternatives or give suggestions in how I feel might improve upon the method that is already in place. However I truly cannot do an assessment of what is a better method for you without working with you personally. I do like that you are thinking and assessing what you are already performing.