looks fine to me.

the only over weight corns i've seen in person had a pudgy feel to their lower sides, if it doesnt feel pudgy, i'm sure it's good to go. imo a snake cant be too big as long as it's solid and strong feeling. you want to avoid a mushy feel, stretched/seperated scales, and things like that.

2 medium mice sounds a bit small for a 6 y/o, but it's obvously not starving so i guess keep doing what you're doing.
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1.1 Argentine Boas
1.1 Dumerils Boas
1.1 Black Milk Snakes
2.3 California King Snakes
1.1 Nelsons Milk Snakes
2.2 Corn Snakes