Depth and width wont matter as much. I got this zinc Esc key that sits slightly higher than my other keys (doesn't matter since its Esc anyway) but it was actually because the stem (where the + sits) is actually slightly longer. If you notice, the cherry switch + male insert isnt that deep, and usually the female + on the key is always deeper. If it bugs you that much, can probably lightly sand some of the stem until it sits properly. Don't grind anything else, keep in mind the its the switch plunger that bottoms out, not the sides of the key as you can still wiggle the key when you bottom out. Hope this helps.
Show Image
(http://img.photobucket.com/albums/v370/bbyxquisite/IMG_2552.jpg)
actual picture of my Ducky Shine 2 with Cherry Reds.
I kept them on last night while I finally installed it into my home PC (got it at work right before going on a vacation, and first time home in 7 days). After playing games on them/typing for a few hours, and wiggle/pushing them down a bit, I believe they went down even further. But not as far as the others. I believe it's something I'll get used to, but I don't think it's that big of a deal anymore. But maybe I'll try to sand the "+" key in the back of the keys a bit... Not too sure how much I trust myself though.