Tunes CfL for 4x4 blocks and compensate for TF scaling

subset1 results
luma:
    PSNR -0.134846 0.00708469
 PSNRHVS -0.0827634 0.00606356
    SSIM -0.132282 0.00536598
FASTSSIM -0.0761702 0.00245465
Cb:
    PSNR -0.984953 0.0338204
 PSNRHVS -0.322431 0.015904
    SSIM -1.00691 0.0268581
FASTSSIM -0.594378 0.0124368
Cr:
    PSNR -0.496393 0.0232284
 PSNRHVS -0.20442 0.0117632
    SSIM -0.577023 0.0201109
FASTSSIM -0.608689 0.01373