Reed-Solomon decoder parameters

I think most RS codes use the 0 and 1 for your first root and root spacing parameters. CCSDS is the only code I remember that used different values. My guess is that if the spec doesn't explicitly mention these values then these values are correct.

You say you're decoding a captured codeword. Do you know if this captured codeword is corrupted? If it isn't then just send the first 34 bytes through an encoder parameterised the same as your decoder. If it doesn't generate the same parity symbols then your parameterisation is wrong.