Another factor to consider is that much of the bait will wait until the last part of the tide to make a run for deeper water and will be forced into these trenches.
Stripers in many of these areas have become wary because of increased fishing pressure. Because of this - much like the challenging ocean-side tarpon fishing in the Florida Keys - it's a good idea to upgrade your tackle. Start by using a leader at least 12 feet in length. It also helps to fish one of the clear-tip fly lines. It can often spell the difference in success.