Lets look at the misses, did this earlier in the season and it still looks similar.
Missed 2 against GB (Missed from 53, 63, and had a 50 yarder blocked)
Missed 2 against the Browns (missed from 35, missed from 63)
Had a 40 yarder blocked against the 49ers (week 8)
Missed from 48 against the Vikings (would have been a game winner)
Missed from 52 against the Ravens (in terrible windy conditions)
Missed from 52 against the 49ers (and had a game winning 48 yarder blocked)
Essentially was blocked as many times from inside the 50 as he missed (the blocking unit needs to get their $#!t together). 20-30 looks bad, but the misses kinda tell the story. Gotta remember he missed a couple games and was definitely hurting towards the end of the year with that quad injury.