I have vacuumed my Bullseye before each cook since day one. It works better for me. I am usually too full & full of beer to vacuum after. I just wait till next use to do it.
Sorry, I don't know. I used my 590 maybe three times. Didn't care for it and immediately got the 380 and have used it ever since. My 590 has been under cover all this time in the garage.