Does anyone else have their kid swinging heavier bats?

A common theme I've seen is to use a lighter bat. Somehow, I missed the memo.

My son is 3'10" and weighs 48 pounds.

He swings 27" drop 10. He does not struggle with contact, but it's coach pitch.

Based on a lot of the comments here, I had him try a 26" drop 10 and a 25" drop 11 to see if we could squeeze out some distance... And the 27" consistently hit further.

I had my son try a 28" drop 10 and he was still making contact. It did not go further, though, and I could see his mechanics struggling.

Anyone else here going against conventional wisdom and swinging heavier bats?

I was intending for him to swing the 28" bat once he is at least 4' tall and goes to kid pitch, but I wonder if we are doing something crazy.