I tend to prefer gloves tigher rather than looser for dexterity, but it all depends on how much too small the smalls are--can you still move your fingers easily? If not then you should go with the medium's but if you can move your fingers well and it's just a little hard to get the gloves on and off then the small's might work. Another brand you might try is Atlas gloves--they are the absolute best I've found so far for dexterity, I basically don't feel like I'm wearing gloves when I have them on, but they keep my hands from getting dirty.