My form is very terrible and it doesn't really matter whether there is 505, 525 (I pulled that today) or 365 on the bar (Anything below is exception, because I can just squat the weight with back straight from lower position), my back gets into this terribely looking position - I just deadlift lighter weights faster with the same form. Funny thing is I get no pain nor pump in my back, never ever had a single problem with deadlifting, maybe with front squats a little bit. I think I have kinda learnt where to put the bar, my feet, hips etc, so I just brace my core extremely hard which creates that rounded back and pull. If I don't, my back rounds anyway, but I just pull less because I am not braced.
Thing is, is this dangerous? Is this ineffective? I know some pros deadlift with rounded back, but I am nowhere near their numbers.
If yes, how do I fix it? I can't keep my back straight with the most effective position and if I drop the hips down, they shoot up, of course. Stretching my hamstrings? I cannot even put my palms on the ground with stiff legs, so my flexibility is nothing impressive, I guess not that bad either tho. I honestly can't tell if it is upper back rounding or lower back too - I heard only lower back matters. If I hip hinge (So much that I feel the stretch), I get in quite a good position, but It feels so weak, but might be a flexibility issue too. Any suggestions?
I am 6'4, 205, so very tall.