Do you mean "not enough mid-bass?"
First, check to see if you wired them out of phase by mistake, never hurts to check.
It's also possible that the speaker doesn't do well with the sort of 'leaky infinite-baffle' that is your car door. You might want to try to seal up the door as best you can (pretty much impossible) or create a sealed-box behind the midbass, but that's going to be tough.
Another option is to get a 2-way active crossover and use four channels of your amp for the doors and dedicate 2 channels to midbass and 2 to the mid/high combo. You can use your passive crossover for the mid/high seperation, and you could adjust your midbass independently of the mid/his.
Then you could run the rears off of your deck power, if if has 'speaker' outs. Who cares about the rear, right?
