Unstable kitchen sink faucet.?

I installed a new stainless steel one-hole sink along with a new Kohler faucet. We have no plumbing problems, however the sink seems unstable when using any force on the handle. Are there any installation tips regarding the durability of the sink.
It is a 1-hole 2-basin sink. The weakness seems to reside in the raised area behind the two basins where the faucet is placed. It appears only for aesthetic reasons and runs two thirds across horizontally which seems to lose support for the faucet.