Cover in SD and DD

Hi everyone,

I'm treating myself to a trip to vegas in a few months where I intend to do some counting at the bj tables. I'm an experienced player in my home country where only shoe games exist. I'm trying to get my head around how I would play SD or DD as I use a four level count so I know the count would be jumping all over the place. I'm trying to determine a strategy that would give me a reasonable amount of cover for these games. I know I eventually will be asked to leave but I want to last longer than 30 minutes. Any advice would be appreciated.