I agree with stbernard, have you thought of trying a crate with Chase? Paper or Pad training can be hard for some puppies, especially in a home. We use it at the shelter simply because the nights are far to long for a puppy to hold it in a crate (they do however always have open crates in their runs just to get them used to it).
A young puppy can not "hold it" for very long, so if the paper/pads are not readily available to them at all times, they will go wherever they see fit. And once they have gone on the floor, they are more apt to do it again - even when the paper is available. It sounds like Chase may think of the pads as an "option", not a nessecity.
By using a crate, you take away the "option" of going wherever he wants. Naturally, no dog wants to go to the bathroom where they eat and sleep, and will therefore learn to "hold it" until they are let out of the crate. This makes housebreaking 100 x easier. Crate Chase whenever you can not supervise him. Then, as soon as you take him out, bring him straight outside (or wherever his "bathroom" is going to be) and give him time to do his business. When he goes, praise him like crazy! He will soon figure out that when he goes in the proper place, he is lavished with attention (a puppy's favorite thing), but when he goes in the wrong place, he is ignored. Make sure you always bring Chase to the same spot, so that he associates that spot with relieving himself. At first, playtime should always take place inside, far away from his "bathroom" spot so that he can tell the difference, know what is expected from him where, and react accordingly.
Do everything you can to avoid Chase having to mess in his crate, as one accident is a big step backwards. As I said, keeping the crate clean should be a nessecity, not an option.
Also, make sure the crate is a "good" place in Chase's eyes. Feed him in it, give him toys and small treats. Make sure there is a comfortable blanket for him to lay on. Most importantly, never use the crate as punishment. If used correctly, Chase will actually enjoy spending time in his crate (so there's no reason for you to feel bad about using one).
Sorry this was so long. Good luck!