Just because the YF-19, VF-19, YF-21 & VF-22 are stressed for higher (30 + ) G force ratings than the VF-25, doesn't necessarily equate to them being more manueverable, or being able to pull tighter turns than the VF-25.
The higher G rating is pretty meaningless anyway if the pilot is unable to withstand that amount of G force.
If the Ex-Gear in conjunction with the ICS lets the VF-25 pilot withstand higher G forces, up to or near to the planes limit, then the advantage is definitely going to be with the VF-25.
GrRaham