Corners over Technique vs Twins

we go corners over every chance we get.
our league is a match-up league and we want our cb's on their wr's at all times.
on the twins side, we have our nickel as an extra player, who can either bump the wr or blitz off the edge, or hang and read. that is really a play making position for us.
on the te side we "combo" the te with the f/s and the ss.
we will cheat the f/s anywhere from the center, all the way to over the te, depending on where the ball is, backfield set and the ability of the f/s.
if the te releases vertical, the f/s will pick him up.
if the te releases outside, the ss will have him.
both our safeties read through the te to the ball.
if an rb releases outside, the ss will have him.
when teams do run to the te, or ss forces the play, and the f/s is a quick-fill player, based on his read off the te.
we do not get hurt by twins, and many teams don't run it as much b/c of the cb's matched on their wr's.
we do this out of our 4-2 package and our weak eagle package.
our guys like it and it has been extremely effective.

Coachholtz

In this cover 9, Are the corners playing straight man or are they in banjo? I assume that the saftey on the TE side is reading the TE and plays a robber technique, what about the saftey on the twins side? What are his pass responsibilities? Are the backers playing zone too or match?

thanks