whether you have a 16x19 or 19x16 pattern racquet, the ball hits the center mains/crosses the same way, i think it would be safe to say the center 3or4 left/right and also top/bottom from center, for a total of maybe 6or8 mains and 6or8 crosses from center,
not all the mains and/or crosses are gonna make contact with the ball!!!, only on of center shots which would provably not count anyway will the outside mains/crosses come into play,
so, if the ball is suppose to hit the center of the racquet ONLY, then it does not matter how many more mains/crosses you have out to the sides or top and bottom, it will not touch the ball,
also, adding more mains and/or crosses does not change the spacing in the center of the racquet,
the center squares where the ball is going to be hitting are still the same size on either a 16x19 or 19x16 pattern
if you wan a spin friendly racquet, you need a racquet that has the center mains/crosses as wide appart as possible