I usually see better results when I multi-table as well. I'd assume it's for the same reasons you mentioned, but I haven't really thought about it too much. I just seem to flip my attention between the tables and go a lot on instinct. One thing is that I don't get too caught up in trying to force a marginal hand. I'll just let it go and move on to another table, thereby limiting any losses that the hand may have incurred.