Like wowsers said, there is no need for you to stress on this topic or to try to avoid saying that you live exclusively outside of Canada.
My husband, (the sponsor) is a Canadian citizen living abroad. He's been outside Canada since 2007. We had no problems with our application and with convincing the VO that my husband will resume residency in Canada.
Just to give you an idea of how we handled this:
1. My mother in law wrote a letter saying that she knows of my husband's intentions of coming back to Canada and that she will offer us housing and financial support until we will be able to establish ourselves there.
2. My husband wrote on all the forms that he intends to return to Canada as soon as I get approved as a PR. He also wrote a letter explaining our plans of relocating and the reasons why we wish to live in Canada (after 6 years living abroad).
3. He mentioned at some point that he will not return to Canada without me and that we don't wish to be separated for long periods of time.
4. He explained that, although he cannot find a job in Canada to show proof of his intention to move back, he is following job postings in his work field and is ready to apply for a job as soon as we get there.
This is what the officer wrote on our file (we ordered GCMS notes after the application was approved): "Long term married couple (bla bla - story of our relationship)....Sponsor is a Canadian citizen living abroad, wants to live alongside his family and the couple does not feel at home in their country of residence. They plan to travel to Canada as soon a PA's visa is issued. Well documented relationship. In light of the preceding, I am satisfied that this is a bona fide relationship and sponsor will return to Canada. No condition applies. Pass on eligibility."
In my opinion, be truthful to them about your plans. Have your mother or other relatives in Canada write a short letter, just like we did. Have them confirm to the VO that your plan is to come back to Canada as soon as your husband gets approved. You should also write a letter explaining your plans. Give them as many details as possible.
Immigration officers are not three-headed monsters. They just don't read minds, that's why we have to put it all on paper for them to follow our stories and to understand our intentions.