Yeah I'd say raise more.
With 8 or 9 callers you can pretty much play any 2 cards, you are getting sufficient odds
to play anything really.
Trouble is unless you hit the nuts on the flop, you are going to find it very difficult to know where you are in the hand because they could have virtually anything and will probably call or raise way too much.
So you need to control the table more, force people to fold preflop more, this means tightening up your post flop play and being far more agressive when you do play. Also try not to play cards unless you are in late position. When you raise big, the last thing you want is 4 callers so you need to be sure you can reduce the field to just one or two.
If you do this then you will get a very tight table image.. this wouldnt work against better players as they simply would avoid any pot you were in.. but you have to keep in mind these are not good players and this is the way to beat them.