Forearms get a lot of work on Back & Bi day also. I personally would not work my forearms daily. If I'm on a each muscle twice a week, forearms would be twice a week. Each muscle once a week, forearms would be once a week.
As far as your routine, maybe it's time to switch it up. How long have you been on your current training split? Your body will build up tolerance and become "comfortable" after a while of the same thing.
No one routine is king. Try something new out. That's the only way you will know if it will work for you.