At the rate things are going, the "over-representation" is likelier through Quebec (cf. Trudeau-vs-Clark 1979: Libs ahead in votes, but Cons ahead in seat totals due to all those wasted Lib votes in Quebec).
In fact, in the ROC, w/a few Vancouver East-type exceptions (or personal-mandate prima donnas a la Jack Harris in NL), the NDP hasn't been nearly as electorally monolithic as the HarperCons have historically been in Alberta. And speaking of Alberta, remember when people were underestimating Rachel Notley's "seat reach" because of presumed overconcentration of their vote in Edmonton--they were wrong...