Should I double or not?

There are times in pitch games that you're goin' to hold a Hard 5 or 6 vs. a Dealer's 3-6. Basic Strategy tells us to hit, but if the count is sky high, say, +40 for the hi-lo, it's better off to double. In Ian Anderson's classic, "Turning the Tables in LV," he doubled on the 5 and got barred (check out the chapter "Some good news & some bad news").
To be honest, I doubled on a 5 vs. 4 once in the shoe game. I won the hand, but it made me very uncomfortable...