Well unless someone were a whale they wouldn't notice a difference with a 1" pin, since 1" is a good bit into muscle even in glutes, its just not as deep as 1.5"
Subcutaneous is pretty dang shallow especially for folks who are lean. Let me give you an example of its "less effectiveness". BTW this is only my experience, Im not making any medical or research based facts... First time I used HCG I mixed too much BA water with it on accident and it was pretty well diluted around 250Iu's HCG per .75ml
So I was still using it at the most I was comfortable with Sub Q about .65ml and I would have a nice lump under injection site my skin for oh a solid 2 weeks... That means its sitting there not being absorbed into the blood stream for that long period. So my conclusion would be that it was pretty inefficient knowing that I could put 2ml's in my thigh and have it absorbed in couple days max.