Sorry, he is actually about 9.5 inch length. Weight about 2150g.A 7.5" star would normally weigh between 1300g and 1400g. A female ready to lay eggs could be up to 1500g.
Are you sure of the accuracy of your scale? tortoises don't get fat. They do not store fat as energy reserves as mammals do. You tortoise looks fine from what I can see. If they do get bloated or look "fat" it is normally retained water which is not good if it is making them look fat as they is edema. I don't see that with your tortoise.