I do the majority of my fishing with bait casting rod's and reels. Closest I have come to cast very light jigs is 1/4 oz. Most my setup's will do that but get down below than and bet's are off. I have an ABU 2500, 1/4oz best I can do. Also have a Daiwi RG on a Celilo Kokannee pro rod rated for 2-8# line but 1/4oz is about the best I can do with it also. Maybe it's a mind thing? When I fish for crappie all I ever use is spinning rods and reels. Ultra light Ocuma is my favorite set up. I think it might be I need small jigs here. Biggest crappie I've caught out here was 13" and normally they only go about 8". I guess small is better for small. Now if we had theos bigger fish I see on the internet, I'd go bigger. Second crappie I ever caught I don't recall the size but I was bass fishing using a 1/4oz plastic jig. Seem's to me heavier jig's require bigger fish.