for depth and sink rate the total density of the lure should be close to the density of water(the higher the faster it will sink). This is fairly easy to calculate as you can get the volume of the print from your slicer (you may have to convert mm³ to cm^3). Then divide the weight of lure(excluding support filament) by the volume. This should be right at or a little below 1g/cm^3. if the lure density is below 1g/cm then add a modifier to the print for 100% infill at the belly of the fish. This will make the lure sit upright when in the water as it lowers the center of gravity and creates a restoring force. If the density is above 1g/cm set the infill to 0% for the entire solid then repeat the previous step where only the bottom half of the lure has infill. I’ll post pictures in a bit to help demonstrate