static pages space

Hello support team,
Yesterday I send a request to you about adding more static pages in shapely theme. You answer was very quick.
Thank you, the solution you gave me to remove the sidebar works wonderfully.

However, even if I changed the blog template to full width (as you suggested), there is still 1/3 of the page blank.

I have another question:
Is is possible to insert a contact form instead of the call for action button?
I tried the jetpack blog subscribing widget but impossible to customize it (change colours and add a name).
Any suggestion?

Thanks in advance, you are doing a great job.