Nanos doesn't have polling for vote intention for immediately before the May 2 2011 election. What they have:
October 12 2015
http://www.nanosresearch.com/library/polls/20151011 Ballot TrackingE.pdf
May 1 2011
http://www.nanosresearch.com/library/polls/POLNAT-W11-T474E.pdf
April 30 2011
http://www.nanosresearch.com/library/polls/POLNAT-W11-T475E.pdf
April 30 2011
http://www.nanosresearch.com/library/polls/POLNAT-W11-T476E.pdf
EKOS was the public pollster that was closest to being correct on May 2 2011 and has their polling in their archive
October 11 2015
http://www.ekospolitics.com/index.php/2015/10/tie-continues/
April 29 2011
http://www.ekospolitics.com/wp-content/uploads/full_report_april_29_2011.pdf
April 29 2011
http://www.ekospolitics.com/wp-content/uploads/seat_projection_april_29_2011.pdf
May 1 2011
http://www.ekospolitics.com/wp-content/uploads/full_report_may_1_2011.pdf
I think that you are counting apples and oranges. What's important is the relative order and difference between the parties. In BC, the Conservatives can benefit from vote splitting and win the seat under First Past The Post. They may get 21 seats as they did in 2011 if the NDP and Liberals supporters are unable to come to some workable plan for strategic voting. A plan that has a bias to NDP seats in BC is not going to form a majority Liberal government. The NDP thinks that the Liberals will be forced into a coalition with them, but Justin Trudeau has made it very clear - no coalition with the NDP. I think he'd rather go back to the polls for an election in January 2016.
In Ontario in 2011 the Conservatives demonstrated just how effective they will be if there is vote splitting between the Liberals and NDP. The result was a majority Conservative government.
The NDP can't even form a minority government with their support levels. But as NDP MP Pat Martin said in a Friday interview "Harper sleeps easily at night as the NDP and Liberals beat the shit out of each other"
Essentially, I disagree with the idea that any political party will get the same amount of vote as they got in 2011. It's a demonstrably mistaken notion if a person compares the previous election results from any election to the election results in the next election.
Each election is about the voter's perceived view on each political party and how that party's policy will benefit that voter.
In 2011, the Liberals had lead a failed non-confidence vote where they got stabbed in the back by the NDP. The Liberals were perceived to be all about regaining power and not interested in benefiting the voter. When the election was forced because of a motion that the Conservatives was in Contempt of Parliament
https://en.wikipedia.org/wiki/Canadian_federal_election,_2011
So, the Liberals had been weakened by the NDP backstabbing and the resulting vote splitting in Quebec and Ontario resulted in the May 2 2011 election result.
Justin Trudeau has made it clear that he won't entertain a coalition with the NDP and Gilles Duceppe also has no great interest in trusting the NDP. Possible coalitions are Liberals and Bloc if the Liberals only have a minority or Conservatives and Bloc if the Conservatives only have a minority. Gilles Duceppe has indicated that he's open to coalition if it's to the benefit of Quebec.
Quebec has now had 4 1/2 years of NDP representation.
That's why Quebec is again in play. I personally believe that the Bloc is going to recover many of the seats that they lost in 2011. However, the national polling currently has the Conservatives, Liberals and NDP in a three way tie in Quebec. The winner of each seat is going to be all about how the vote splitting goes.
Ontario also now has 4 1/2 years of NDP representation. NDP MPs resign to run in provincial or civic elections, then run for the nomination in the by-election to fill the seat that they vacated. In most of the seats currently held by the NDP, vote splitting got the NDP MP in ahead of the incompetent Liberal. The Liberals look to be recovering all of the Ontario seats that they lost to the NDP and most likely the Ontario seats that they lost to the Conservatives because of vote splitting. Again, the winner of each seat is going to be all about how the vote splitting goes.
Just to emphasize the NDP attitude of cooperation
http://www.theglobeandmail.com/news...rals-to-defeat-conservatives/article26781579/
The various strategic voting sites organized by the NDP are happy to recommend that Liberals vote for the NDP, but - as Thomas Mulcair states - having NDP vote for Liberals is not on.