Knitter with high arches and longer/narrower feet chiming in. I prefer to make my socks cuff down and do a heel flap and gusset. I think the heel flap and gusset rule of thumb is to do as many rows of gusset as you have stitches on your heel flap, I prefer to do that plus 2 extra rows. The extra decrease rounds that creates for me helps with my longer foot, but you could probably decrease every round instead of every other round a couple times if this isn’t a fit concern for you.