You could use some tough love here. Feed nothing but veggies for what length of time it takes for him to recognize the veggies as food, no Wardley for the entire time. Use tips mentioned in
Turtle stuck on pellets..... With this turtle it only took two days for him to make veggies part of his diet.
Sonyj is right, you should cut back on pellets at this time, to once every two days with veggies every day.
This just got me thinking, with my recent vacation, the guy watching over my turts was overfeeding them for half the time I wasn't there. Two days before the end of my trip, the A/C broke down. Maybe a combo of overfeeding with skyrocketing water temps over 90 (yeah, it got that bad) made everyone grow about 1/2 an inch.