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Emyr-
Any that are sub 5mm?
Couldn't find anything under 7.1mm (FSA, natch)
I think you can bin the upper cover and run the stem directly on the upper bearing collet, like all the hardcore stem slammers in the pro peloton
Nacer Bouhanni
Ryder Hesjedal
IIRC, somebody once enquired about a slam-that-stem cover for a Zero Stack, but didn't go ahead as it was only going to gain about 2mm on their set-up. You could have a lok at your upper cover and see whether there's a worthwhile amount to be had from yours, I'm about to produce a batch so it would be easy enough to add one sized to suit.
You could just go for a -17° (or even steeper) stem if you want to get lower.
gbj_tester
Cane Creek ZS44 uppers are 8mm, which is also non-zero :-)