Effect of adding weight to driver head

heavier weighted heel side lighter toe can help close the face easier

say 'can' because it also depends a bunch on the way the club gets delivered at impact

if say the norm is a delivery with a bunch of handle drag so 'holding off' release may be little or no difference at strike

& if say the norm is a delivery with high hands & handle so much more vertical shaft angle (something which can tend to lead to heel strikes) if the hands/handle delivery stays as is it will then tend to still pretty much override any 'weight change'

if though the driver shaft so head gets delivered at an optimum 'plane' angle then the heavier heel side can close the face down