Your missing more like 70-120mAh (for 1A down to 2.8v). Test / Review: Keeppower 18650 3400mAh Black. Full capacity is only at lower current & down to 2.5v. Panasonic actually gives a typical capacity of 3350mAh, minimum 3250mAh. NCR-18650B specs
I would check the cell anyway tho. As long as you have shrink wrap.