Display 'content' BLOCK between Breadcrumb and the Node (and not after the node' content)

Using 4.7.2

I am trying to put a block between the breadcrum and the content of the node itself but the only thing I manage to do is to have my block After the content of the node.

I have:
Block displayed in the header
Breadcrumb
Content (node, register, forum, login...)
Block displayed in the Content
Block displayed in the Footer

But I would like:
Block displayed in the header
Breadcrumb
Block displayed in the Content
Content (node, register, forum, login...)
Block displayed in the Footer

The practical application of that is to have a Introduction text before the /user/register page. I created a block that I put in the content to do so. However it appears AFTER the registration form.
The work around is to put that block into the Header...but then I have the breadcrumb in between the block and the registration form...not nice!

I have a temporaty work around: I have removed the breadcrumb for that /user/register page (editing the page.tpl.php page - I am using a modified version of FriendsElectric.

Any help warmly welcome !