Look like ibera to me - definately not hermanns. Sack the vet, he obviously has no idea. He should also have told you they were growing way too fast. This is why the nuchal scutes have gone off at an angle and are not pointing forward over the head as intended. These torts should weigh something in the region of 60 - 100 grams now but judging by what you say probably weigh at least four times that, which means there could be problems going on internally. I wonder what speices of tortoise your vet thinks is usually imported!