You may have to have one custom built. None I know of has more than 17 degrees. Or, buy a new fork and cut the steering tube longer so the stem is up higher. Of course, NEVER post a photo of that here, as the "Stem Police" would have a field day!
If you have a + or - 17 (73 degree) stem flipped into the upward position, rather than horizontal and still need more angle, then your frame is too small, or at least the head tube is way too short. Flipping this angle of stem raises the bars about 6cm and shortens the horizontal length by about 2cm.
You might find some MTB stem with more angle, but the bar clamp diameter may be a problem, unless you can find one in a 31.8 and have oversize road bars.
IRD 25deg.stem...You can go to the IRD site (google:interloc racing) I use the 17deg to get an effective reach closer to 95mm on a 100mm. The IRD is a good stem, but is now $60...a bit expensive.
The 25deg. stem will shorten the reach considerably compared to a regular angle stem....keep this in mind, and check out the Zinn cycles stem calculator to get a reach length on a 25 deg. model.
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