We only have a 48" E net and clip one right wing twice during first year growth. It seems after the first molt they don't try the escape anymore. maybe weight gain or previous tries failed. I don't know.
This is only with the Kathy line and two older EEs. The hatcheries were more prone to flight so I clipped them continually.
Could you be leaving to much primary feather at clipping. I clip fairly aggressive .
Of course there is always and exception to the rule. If you remember Kathys Flozzie .
I think that was its name. It held the Mo chicken altitude record if I remember.
Chickens are fun. Huh ?