I did some easy calculation and we have 78 combination ,which 35 is below 13 and 36 are above 13 and 7 combinations are exactly 13 which means odds that we have higher than 13 is 46,15% and lower 44,87%
Not encouraging so far.
But when we have high count mayby is it good to play over 13 .
But how big the count must be ,this is question.....