OOOOOOOOOOH NO.........Now you've gone and done it.
Anything pulling as good as a KM? And Chinese at that?
On a serious note, it's not impossible for a Chinese rig to pull as easily as a KM. Check the diameter of the downstem and hoseports on both. Are they the same size? Is everything sealing properly? Especially on the Havanna? You shouldn't notice a difference between hoses, but I'd switch them just to compare. Are you getting the same amount of smoke from both setups?