I bought and was prepared for, no genetic mutations to be visible on my pets once used. However after using it a couple times on my tamed pets, it wont even say if a gene isnt visible but carried? Is it just a chance that lesser genetic mutators simply do not work or make a difference?

A pet needs to be Genetically Tested in order for you to be able to see Carried traits (and hidden traits, but those aren't relevant to Mutators)

You can find people offering free genetesting services in the Groups, Guilds, Clubs, and Services forum

Thanks!