The only week you'd even think about benching Chad the rest of the way is week 14 against Baltimore. Even then, he's probably among your better options.
This isn't really the forum to ask a bunch of start/sit advice. For the best advice, go to the 'Who to Start/Bench' forum, or post your team in the 'Roster Ratings' forum.
Don't take the ridicule in here personally, after sorting thru all the 'help my team' and 'will I win this week' topics sometimes we get a little testy with the newbies.
The meek ain't gonna inherit $#!%....'cuz I'll TAKE IT!