That bar angle is pretty extreme. Why don't you adjust it yourself. Just take an Allen wrench, loosen the stem face plate bolts, rotate the bars (try it with the ramps and hoods closer to horizontal), tighten the bolts, then put all of your weight on the brake hoods and push down as hard as you can (hop your feet off the floor) to make sure the bar doesn't slip.

It looks like someone set that bike up, thinking they could reduce pressure on hands (super short stem, steerer extender, bars rotated way back). But I'd push the saddle rearward first, before trying that bar/stem setup. Why did you change to a seatpost with zero setback? You might want to try the original post again. Your saddle has short rails which limits the ability to move it rearward.