Also underdeveloping and printing at a higher contrast - ideally with point source or condenser enlarger - will make the grain "grittier".

The only time I've had visible grain on a contact print was when I developed in monobath process. Something about the thiosulfate dissolving and replating the grains, perhaps? But it's a chancy procedure that takes a lot of experimentation to find the optimum composition for each film / purpose.