I agree that you should keep loose hay in your chin's diet if possible. Some big ranchers don't use loose hay, but it really is good for their teeth.
Have you looked for orchard grass or bermuda grass in your area? These are other types of grass hay that can be used in place of timothy.
Otherwise you can buy large boxes of hay online if buying it in the pet store doesn't work for you.
I haven't tried APD, but mine all like Oxbow.
ETA: where did you get your Oxbow? If it was from the pet store it could have just been sitting in their warehouse for far too long. I get mine direct from Oxbow and it's always been nice and fresh and green. I know not everyone would want to order direct, but I sell it in my store which is why I order it direct.