Ewww.. I really don't like that setup. It's not because the fact that you have Polamalu at LB.. it's the fact that you have Woodley not as a LB... and that you have Timmons/Harrison both at MLB.. If anything, you should definitely switch Harrison or Timmons for Farrior.. you NEVER want a 75 speed guy in coverage.. you have an 83 speed guy which is a huge difference on the line.
You will want to switch Farrior with either Timmons or Harrison because if you A-Gap blitz.. only one LB is going to get to the QB.. the other LB is a space eater.. he just takes up a block.. he never uses his speed.. when he has 85 speed, you are putting the guy to waste..
Since you are comfortable with having Keisel at DE, you should put Patrick Bailey on the line on the opposite side.. just because of his 77 speed.. his speed will definitely matter.
I don't like the fact that Farrior is not able to go on the line, but he can sit as a backup.. His overall may be good, but there's so much that goes into OVR that don't matter.. Awareness... if you user this player.. awareness doesn't matter.. awareness doesn't matter either way.. it's just a stat that does not work.. but A LOT of points to overall are from it..
I would rather do this:
MLB: Harrison / Woodley (if you prefer Farrior, you can have him here, but he's definitely not a good person to have in coverage)
OLB: Polamalu / Timmons
DE: Bailey / Keisel (If there is a faster DE/LB, you want him here)