Special Teams formations is the only thing on this team I don't worry about. But to answer your question...
It's actually not bad. The average Punter stands 13 yds behind the snapper (15 if the snapper is talented). Ideally, the ball needs to get from snapper to punter in the 1.6-1.7s range to give the punter enough time. The shield is ideally placed to where the punter has enough room to get the punt off, yet the shield can slow any diver/jumpers and restrict the point to where they can jump/dive to block. If punter and snapper do their job, there shouldn't be any problems unless the line decides not to block all together.