ATH, my cypress is in sandy loam soil.
I water it at the very outer of limbs.
At one time I used to drown the trunk but stopped. I also was punching holes all around tree to give it plenty of oxygen pathways.
No way to stop the knees They will do what they will do.
Spread mulch around the tree out to the drip line then you won’t have to fight the knees with the mower and both you and the tree will be happier.