What about getting a King Steelset headset.? The cups go in over 25mm deep.
http://chrisking.com/headsets/hds_steelset
FSA also make the Pig headset. They are a ‘Deep Cut’ design and the cups go in about 12mm.
http://chrisking.com/headsets/hds_steelset
FSA also make the Pig headset. They are a ‘Deep Cut’ design and the cups go in about 12mm.