Nice equipment there. I'm a little concerned about the surface the washer's mounted on, seems to be thin concrete over a dirt floor (and the dryer is on plywood on a dirt floor). If it were me, I'd dig down about 6" and pour some reinforced concrete into that area, and the top inch of the slab would be special self-leveling floor-topping mix so it came out perfectly level. That would solve the vibration problem permanently, and prevent the machines going out-of-level due to uneven ground pressure.
Gotta' question: how hot is the Sanitize cycle, i.e. what's the max temperature to which the washer will heat the water?