El26 with cwm is the latest safe kernel to flash with. El29 and later have rogue repacks and are not safe to use to flash from ICS to GB. I have flashed from ics to ics using fd02, fb21, and a few others with no issues(doesn't mean its safe). Only use el26 with official cwm to be safe.
Edit: especially when flashing to/from AOKP/CM9/AOSP.
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