Currently, my routine is as follows:

~Sunday~
-Speed Bench
-Military BB Press

~Monday~
-Heavy Squats
-Speed Deadlifts
-SLDLs

~Wednesday~
-Heavy Bench
-Dips
-DB Flies

~Friday~
-Heavy Deadlifts
-Speed Squats
-Chinups
-Yates Rows

Today I was doing SLDLs @ 200 lbs. with a mixed grip. I did my first set of 8 reps, then on my second set, I was pulling rep #8 but my grip failed before I locked out, so I definitely know that I need to start training my grip somehow. I am planning to get Captains of Crush grippers but I doubt that is enough. What should I add to my routine for grip strength?