The are only 256 unique EFCs, which are UEI's attempt to encode and obscure the actual function numbers. So it really only makes sense to search on the range 0-255. You can do the entire set in less than an hour.

I hoped that the digits you have found would lead us to the others, but the function numbers don't follow much of a trend.
1 ---7
2----3
3----15
6----77
7----6
8----2
9----14
It's tempting to think that 4 and 5 would be 65 and 69. If so, the EFCs would be 168 and 169.