Since dropping his 14-song opus, Mister 9, Duval hip-hop artist Jahny Steel has done little to dispel the notion that he is one of the most prolific and anomalous creatives in the 904. That is to say: He’s been doing the most.  Riding the buzz of Mister 9, Steel’s followed up a slew of new songs (“Plate,” “Ice,” “Tea”) and …