A lot of this bay stuff is quite true for later in the day. At this time of year any breeze or night-time cooling can erase most of yesterday’s water temps that provided a decent bite so keep in mind what time you plan to fish. An afternoon or early evening will likely be best if you’re going back into those bays. If there is deeper water within a relatively short distance from those bays or in the center of the bays, check there in the early morning. Unless there’s been a radical cold front you’re probably going to locate the crappies early suspended at or near the deepest depth they were at while in the bays. Depending on the body of water I have found deeper water within twenty feet of where water in a bay holds afternoon fish, holding tons of fish while the bay draws a big zip.
I’m an early morning person and seldom look at bays until the sun is well up. I will however spent plenty of time just outside of the bays in deeper water and will catch plenty of crappies before boats and jet heads churn the water up, then I head to the shallower water that bays offer.
When I refer to deeper water it can be anywhere from five feet to twenty feet deeper than the water inside a bay that’s maybe four feet or less and popping out afternoon crappies.