Personally I haven't been to any, so I don't know how much help I am, but I would consider a couple of things:
HDDR is 2 TS credits, do you have 2 too many, or just 1?
Are any of these meals that you or someone in your party are really looking forward to?
Do you have 2 TSs in one day (many people feel that this is too much food and/or too much time)?
How do the times of your ADRs fit into your touring plans? Ex: If your Chef Mickey BF is 10:30, this may really mess up your touring if you are planning on MK that day.
Value-wise, BF is of the least, followed by lunch and then dinner.
If you decide to keep all of your ADRs but pay out of pocket for one, many people feel HDDR is not worth 2 TSs (but again, how many Tss are you over, 1 or 2)?
I don't know how much that helped, but those are some things I always consider when changing/ cancelling ADRs (which I have done NUMEROUS times)! Just want to add, if you do plan on cancelling any ADRs, please post what you are planning before you cancel, so someone else can have a chance to get it. I am actually going the same time (9/25 - 10/1), and I know ADRs are extremely hard to come by for that week. Here is a thread I started just for that purpose:
http://disboards.com/showthread.php?t=1179056