How old are your turtles? Unless they are young that is too much protein which is probably leading to the pyramiding of the shell. I would decrease the protein and increase the veggie intake. Also, do they get calcium supplements?
What size tank are they in, how many gallons of water do they have, and how many turtles are in the tank?
How old is your UVB light? How close can your turtles get to the light?
If the light is older than 6months, it needs to be replaced. Also, the turtles need to be able to get within 6-10inches of the UVB light, out of the water, as UVB does not penetrate water very well.
Make sure your turtles are in a large enough tank for their size with enough water and a good cleaning regement. Increase calcium supplements, or add them if you dont use them at all. Decrease protein, increase veggies and check the UVB source.
Unfortunately you cannot erase pyramiding but you can stop its progression.
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0.1 Bearded dragon
0.1 mexican Black kingsnake
1.1 Leopard Gecko's
0.0.1 Tokay Gecko
1.0 Blue Tongue Skink
0.0.1 Reverse Okeetee Corn
0.1 Anerythristic Corn
0.0.1 Red Tegu
0.1 Bullmastiff
4.1 Cats