When you are mining solo, fees should be the least of your concern; you have a slim to nothing chance of hitting a block, so worrying about 1% less fee is insane. I'd rather pay 10% to CK or Kano knowing these two won't rip me off, than risk mining to a pool with 0% fee which has not proven that

1- It would pay out (this includes ViaBTC too, by the way)
2- It has been able to actually hit blocks in the past (it could be a buggy pool which loses blocks)