I am debating adding a 5 iron in either ZX5 mkII or ZX4 mkII to go with my ZX5 6-AW.Thanks! I wonder if I mix up a set of Zx5's and Zx4's...should I bend the lofts of the Zx4's to match the Zx5's? I dont want the 4's to go exponentially longer than the 5's.