There is no stat gain cap. What I do is get to the skill cap, be it 700 or 705 or whatever your character's cap is, then point skills up and work them. Once you're at the skill cap, you'll get gains from skills that are set to gain, even though they won't gain. So I use anatomy for strength and intelligence and focus to gain dexterity (cast spells and let the focus regeneration raise my dex).