EDIT N factor is 13  use last setings

yacminer --scrypt-chacha --worksize 128 -g 1 --lookup-gap 6 --buffer-size 2590 -R 7552


or this

yacminer --scrypt-chacha --worksize 128 -g 2 --lookup-gap 6 --buffer-size 1295 -R 3776