Personally, I would rather single table a 6max game than play 2 full tables (especially since you don't have PT). Playing one table allows you to focus more, make reads, etc.. Pay attention and I think you will be fine. Downswings suck, but they definitely happen. Losing 4 buyins in a day may hurt, but it happens to all of us. Make sure you are properly rolled to avoid going broke. GL.