Congrats on the PR Parvez - grip is definitely not your limiting factor in the axle.
I won't lie, here is quite a bit of work you could do for your DL form to improve.
The bar starts too far away from you - try to keep the bar against your shins when you start man, it will improve leverages, your knees are forward a lot also - watch your left heel it comes off the ground a bit when you start your pull
this means your whole body is leaning forward and you are pulling UP instead of pulling BACK - the weight is on your toes not on your heel/mid food, your hips are not back much when you start either, your lower and upper back seems rounded the entire time. I know you mentioned you had been in an accident and can't stick your chest out and have issues with your collar bone so keeping a flat upper back may be a problem but focus on trying to keep your lower back arched. Konstantinovs pulls with a rounded upper back as do a lot of other strong pullers but the difference is their lower back is still locked in with an arch.
I would suggest seeing someone in person who could help you with form and work around your injuries brother, you are so damn strong grip wise you could smash records with the axle once you improve your technique and get more time building strength in the posterior chain with a regular barbell.
Also look into sumo, it is a lot less taxing on the back, less shearing force on the spine than conventional you have nice long legs and arms for that style you could get into position for it quite comfortably.
For a long time I struggled with trying to pull conventional because of my bad deadlift leverages, but I stubbornly kept at it trying to reinvent the wheel thinking one day everything would just fall into place and it didn't. It wasn't until my own chiropractor (who used to powerlift himself) suggested I try Sumo, so I have been with a coach via youtube videos Nuno Cuto has helped me improve my sumo deadlift, my pulling sessions feel a LOT better, form is improving every session and my back is feeling so good I am able to train the Cube method 3x a week and grip 3x a week on non lifting days.