adjusting basic strategy to the count

I have just learned basic strategy and the high-lo card counting system. Most of the stuff I have read suggests changing your bet to fit the running/actual count on the table. Does anyone change the basic strategy to fit the count?

If I am in a plus 5 count, and I know I am more likely to get a ten on the next draw, why should I hit a 12 to a dealer's 3?