I looked up the last few elections to see how popular vote led to number of house seats:
Votes received for each major party for a US Representative, seats controlled by that party as a result of the election:
2016: Rep: 49.1%, Dem: 48.0% (R +1.1%), result is a Republican house 241-194 seats (55.4% R)
2014: Rep: 51.2%, Dem 45.5% (R +5.7%), result is a Republican house 247-188 seats (56.7% R)
2012: Rep: 47.6%, Dem 48.8% (D +0.8%), result is a Republican house 234-201 seats (53.7% R)
2010: Rep: 51.7%, Dem 44.9% (R +6.8%), result is a Republican house 242-193 seats (55.6% R)
2008: Rep: 42.6%, Dem 53.2% (D +10.6%), result is a Democratic house 257-178 seats (59.1% D)
2006: Rep: 44.3%, Dem 52.3% (D +8.0%), result is a Democratic house 233-202 seats (53.5% D)
Strange that Congress is never closer than about 30 seats even though two elections have been within about 1%. The Dems held about the advantage they should have had in 2006, then were overweighted in 2008. Since 2010, the Reps have always held more seats than their national percentage and the percentage of seats has not varied more than 3%, even though the election results have varied by 7.6%. The R's in the house from 2010-2016 seem entrenched, regardless of the national vote totals.
And, in response to the poster, the D's have not recently won more than 55% of the vote ... if they did that would be a landslide election.