Starting difficulty is:
"difficulty_sha256d" : 0.00024414,
"difficulty_scrypt" : whatever scrypt diff is at switch over
"difficulty_groestl" : 0.00024414,
"difficulty_skein" : 0.00024414,
"difficulty_qubit" : 0.00024414,
Sorry, but WTF you are doing? There will be such instamine.