I don't have all of the info that you are asking, but I do have the dayton 15" HF. We put in in a ported box, 6.5 ^ft, with 2x 30 inch ports, 4" diameter. This gave it a tune of around 18hz. With a bigger box, you won't need to have the long, 90 degree ports that we did.
At 18hz, there is a lot of output. In the audible range of 30 to 20hz, the sound is intense, windows rattiling, house making noise, and you can feel the floor.
We get good output down to around 16hz, and after that you don't feel the couch moving as much. I can't tell you if the dayton is capable of any more than that however, because the bash 300 amp we are using has a highpass around 17hz, so it may be losing low hz output drastically because of the amp but I'm not sure. Distortion is practically nonexistent, we do get some distortion when the amp reaches it's limits though.
As intense as this driver is, I wouldn't mind more. But I think that is how it will always be until you reach the limits that your ears and body can stand