I fished jigs for bluegills for 30 years, but if I cloned myself and one version of me fished with jigs and the other fished with live bait, the "Bait Deathb4disco" would win by about a 10-1 margin.

But if you're set on jigs, I'd use a 1/32 or 1/16 head and a 1" body. I don't think the body type is as important as size. Last fall, I was taking a 4" Slider worm I use for bass and cutting it into four 1" pieces. The gills loved it. So did the little bass!

I would use nothing bigger than 4# line (2# would be better. You could put 4# on the reel and use a 2# leader.)

Finally, try to find some deeper water. "Deep" is relative depending on where you fish, but bigger fish will spend some time there every day.