Tame the lowest level one so you don't waste your eggs, no matter what level it is it will do the same thing

You'll read a lot online that says the weight of the egg determines the taming effectiveness gain. That is B.S.

An argent egg and a carno egg weigh exactly the same but the carno egg is worth about twice the tame percentage.

Oviraptors will only cover a set area, make sure you place it near the Dino's you intend on farming eggs from. Otherwise you may want to tame multiple ovi's for larger Dino pen's.

Encumber them so they don't move around

The higher the lvl the higher of a chance of twins or triplets. So level does matter when it comes to hatching