That's why I wear a yellow jacket - both my First Gear mesh and Kilimanjaro. Not quite as bright as your vest, but it is noticed.
I also have reflective material on my helmet. The helmet and reflective decals are black until light hits them. Makes a huge difference.
Finally, the PIAA lights under the front cowl, LED running lights in the rear, and a flashing LED brake light finish off my current attempts at being seen better.
Yeah, I'm kinda obsessed with being conspicous.