If you have learned any buttons from your Akai remote, could you download the URC-8811's memory and let us look at it, so we can confirm which codeset is the correct one for you.

There is an area of the File Section, in the JP1 forums, called "Diagnosis Area", where you can load the file.

Or, if you like, you could just post the summary info. To do that, in IR.exe go to File > Summary, then cut & paste the learned signal info. It will look something like this...

LEARNED SIGNALS:
#Device ButtonKeyProtocolDeviceSubDeviceOBCHex CmdEFCMiscNote
1AUX2Old Panasonic3163FF or FD or FE181 or 165 or 189OFF
2AUX3Old Panasonic25480F or 0D or 0E058 or 042 or 066OSc
3AUX4Old Panasonic25202B or 29 or 2A091 or 075 or 099Mode
4AUX5Old Panasonic253627 or 25 or 26251 or 235 or 003Timer
5AUX1Old Panasonic3163FF or FD or FE181 or 165 or 189ON/Speed