I've never had dead fish on the lines. I guess because of the heat?As the water warms into the summer, you had best check them every couple of hours or you'll have dead fish on the line.
Now, not so much unless you're worried about twist offs. If so, put swivels on the stagings from the main line drops. If you just want to, check'em about halfway through the night and then again tomorrow. I would definitely bait up again tomorrow morning as this is the time of the year their active almost all day due to water temps.
Cut bluegill will do just fine. Cut shad seems to work better though as shad just smell worse (or stronger) than perch.
Tomorrow or the next time you bait up, pick a line as a guinea pig. Bait every other hook with a cut bait and the other a live bait (hooked just behind the dorsal fin). This might help to determine their preference at that time.
Heat which helps to create the thermocline. Areas with less or more oxygen. Mid summer the upper areas of lakes (from surface sometimes 10' down) will have less than preferred (by 9 out of 10 fish I might add) for fish to live as will some of the lowest areas.I've never had dead fish on the lines. I guess because of the heat?