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Someone at the Adobe forums answered with this. Not too sure what all of it means since I'm pretty basic when it comes to Photoshop, but I guess there is really no way to view it accurately other than at 100%?

"As they say in software development: "Design limitation". It's how PS  uses the current zoom level to access the relevant cahce tiles and how  blending order is different for life layer effects. Your glow is not  getting smaller, on the flattened version it is just being interpolated  differently with the neighboring pixels to produce more levels of grey,  making your dithering noise disappear if not zoomed 100%. You really  cannot do much about it but work at 100% all the time. Still, it doesn't  really make sense you even use the noise - any scaling operation no  matter whether in PS or another program would just the same obliterate  your noise due to the interpolation, anyways."