What sort of form are your forwards in? I can see they aren't scoring many at the moment, but is it due to lack of chances being created or poor finishing? Against our defense I can see them getting quite a few opportunities on goal.
Weimann has got 3 goals this season,
One against Stoke in the first game of the season
One against Hull at the end of August
One against Spurs in the middle of October
Agbonlahor has also got 3 goals this season
One against Hull at the end of August
One against Liverpool in the middle of September
One against Southampton in the middle of November
Benteke has only got 1 this season but he has been injured or suspended but for 4 games this season and he has been by far our best attacking player and if someone is going to cause you problems it will be him. Remember how he barged Smalling off the ball a couple of seasons ago at Villa Park? which then led to a goal for us.
On how we haven't scored many it's a mixture of both, our midfield doesn't scream creativity apart from Westwood who is injured and quite a few of our goals have come from opposition mistakes. But our forwards are not exactly good finishers either, Agbonlahor and Weimann are appalling and Benteke missed a few against Leicester the other week.
The only problem your defence you should have is Benteke bullying your backline, but if you play three at the back you will be fine as he cannot do it all on his own. Weimann and Agbonlahor will not pose much threat to your wing backs either as they are very predictable.
Hope that helps