Hold on a second before you go blowing things up. You can't just drop the impedance on an amp because you want to. These subs you listed are Dual 4 ohm subs, so how did you wire the coils? Parallel or series? Did you go + to + or + to -? It's going to make a big difference. If you wire the subs in parallel (pos to pos) then you need to run the amp in stereo, which will still deliver the full 250 watts per sub the amp is capable of. Simply hook each sub up to one channel of the amp, and you're set. If you go bridging it when everything is wired in parallel you're trying to ask the amp to run a 1-ohm mono load, which it is not even close to capable of doing.
Now this is all different if your woofers are single coil. If you've got single 4-ohm subwoofers, you've got the wrong woofers for the application.

As for your door speakers, turn down the sub level to match it. You're not going to get them any louder without putting an amp on them.