Umm no.
The Gravis poll here is close to inline with Gallup’s survey when people pick their ideology instead of party ID.
Gallup article - Jan 11, 2016:
Conservatives 37%, Moderates 35%, Liberals 24%
http://www.gallup.com/poll/188129/conservatives-hang-ideology-lead-thread.aspx
Gravis: Slightly + Very Liberal 23%, Slightly + Very Conservatives 42%, Moderates 31%
Your basic math isn’t even right. This poll’s ideological totals are 46% conservative (somewhat or strong), not 42% you just said. Thats an overstatement by almost 10% (based off your own example). That is huge bias. It also shorts liberals 1%.
As far as the Dem v Repub affiliation numbers (Dems +7)
here are similar numbers (again from your own source, Gallup)
Democrats Increasing Their Edge in U.S. Party Affiliation
http://www.gallup.com/poll/190421/democrats-increasing-edge-party-affiliation.aspx
It shows a 6% gap.