Jesus christ can the warlocks be -blam!-ing nerfed already? Everyone used to whine about how the titan was so op with hammer of sol but now that that's been nerfed, the stormcaller has taken it's place. You can't run from a stormcaller like you can a hammer titan and it's damn near impossible to fight back unless you have range.
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Go round a corner, wait. Shotgun melee There. I've taken down enough Stormcallers this Iron Banner with that tactic, you could also try to snipe them. I have a rougher time with Arc Blade than Stormcaller Try playing IB matches as SC and you'll see their weaknesses, maybe with SBMM you may even see some counters you never thought of that you can use. If it's so OP you should be able to rack up easy wins with it surely?