I harvested from a 3 pack of the small bottles, they all have the same yeast I believe. It worked out fine, and I've harvested others from one big bottle and those have taken off too. My only brew with the Chimay harvested yeast went from an OG of 1.073 to 1.016, about 78% apparent attenuation. A little lower than I'd hoped, but pretty good.
So no, I have not found it is too little. Good luck!