Not sure where Black Crappie would be in 40deg water, but once the water warms up to their liking and their spawning urges kick in ... I'd be flogging the banks with those Stroll R's, for sure. You might also want to get a few 1/16oz marabou Road Runner jigs and cast them parallel to the bank as you move down it. (white, chartreuse, & pink/chartreuse should cover most any water clarity you run into)

If you know of a bank with pea gravel & sand ... that could be a good spawning bank. Be advised, though, that Black Crappie can & do spawn in relatively shallow water, plus they tend to stay in those shallow areas for quite some time after the spawning duties are over with. Bays or even pockets on the main lake, that have those conditions (plus maybe a rock pile or brush pile here & there) are also places to explore.

I skipped from 2d (b/w) units straight to Down Image (color) units, then to Livescope (with my DI unit for maps & waypoints) ... so I'm not the one to give any advice on Side View units, but work on getting it dialed in NOW, while the conditions are not as favorable, so you'll be up to speed when the conditions are favorable.

Luck2ya ... and hope to hear of some successful outings. And since we don't have a forum specific to Idaho, feel free to post your reports & pics & further questions on the Main Message Forum.