Hi @spork
Are you using an adhesive kit that came on your screen? In my experience, this adhesive does not stick like the OEM Samsung adhesive did. You should remove any tape that came on the screen and replace it with TESA tape or Red tape.
For the top of the Galaxy S7, I’ve found that two layers of adhesive will be enough to fill the gap and keep the LCD cable from getting pinched while the bottom should only have one layer so the home button can make it through the screen.
Best of luck finishing this up!