I'd go with Grixis Grimblade instead of the hackblade. He helps you turtle and get a longer clock to drop the bigger stuff.
That's a good point, sadly I'm lacking on the Grixis Grimblade right now. If i find two more, I'd probably drop Garza Zol, Plague Queen, and the Decimator Web. Probably keep the Jund Hackblade in for a speed factor