Query about Opisthosoma size on 2 T's

[Ditch crawler]

Can someone kindly look at the above photos and tell me if the Opisthosoma's looks about the right size please or are they
A, overweight
B, underweight
C, about right
I've only had them both a few weeks and both stopped eating and went into premolt within days of me taking charge of them, both are eating machines now but I dont want to over feed them.