Sounds good. I've also asked D-Link to review this as well.
I couldn't get my 1533 and 4500 to exhibit any issues while in bridge mode with the 4500 on 2.4Ghz. I had my roommate watch a netflix movie one evening and he didn't see any issues.
So ya, we can rule out the 4500. Of course.

Keep us posted if you get any info on your side. If you call in, please get a case number and PM me this info.
The more we let D-Link know about this, I hope and presume they will get to reviewing it and fix it.