I agree with your presentation. Subject is the core and principle of what the paper is to be about and topic is what I put into it and how I my mind centers on the bubject at hand. These are to be greatly enforced and dealt with properly in a good strong paper. Keeping the topic in focus allows the reader to be constatly reminded of the issue and approach of the writer at hand. ~ M. Nowell
I agree a subject tells what it is that you are writing about. The topic narrows the subject down to a particular point about point about the subject. I guess you could say the topic tells the readers what about the subject you will be talking about.
A topic is the issue of a conversation or discussion. The relationship between a topic and it's subject is defined to be one of reification.
The subject will be expressed as keywords, phrases, or classification codes that describe the topic of research.
A topic is the thought of a paragraph, book, or research paper.