When using a slow retrieve I notices my darters with flags were not moving very well. I mainly just use one large treble hook on the belly. Good action and makes it super easy to handle fish and release.
I fished mine with single belly 3/0 and flag on back , I feel like the action with two trebles is better overall but single belly treble is safer for the fish and easier for us , inline hooks drop too many fish so I won’t use them , but I also fish fast too bad for inline hooks but good for treble
You might find that it darts better with a smaller treble on the belly and a flag. The bigger treble has more drag and weight so it’s going to resist darting on a faster retrieve or a twitch.
I fished mine with single belly 3/0 and flag on back , I feel like the action with two trebles is better overall but single belly treble is safer for the fish and easier for us , inline hooks drop too many fish so I won’t use them , but I also fish fast too bad for inline hooks but good for treble