I have tried and tried to find them by smell but have never been able to locate them that way.
but have found tons of fish By dragging a short piece of worm/night crawler on a lite hook and a small split shot thru the area !
also I do love finding them with SI but that gets difficult quickly here with all the grass .
Gills/ crackers just started showing up here Friday morning and has got better every day. Still finding 67-69° bottom temps Friday evening.
lots of fish still not on beds where I normally catch them on bed in early April!
I have smelt crappie the same way as gills so that maybe what your smelling and they maybe out just a little deeper!
stay after them with the warm nights it will get really good quick.