Ok, lets test your script without you revealing it to the public, just drop the first 2 characters on the left for this public key's private key :

03cefd304a9a8da40666e97b2d9650e31a71a9a9fcd29a24724d31a2fabbc8ea0e

Do you need the exact range or not? It has 32 characters and it starts with F, just drop the second character and give me the public key for it to verify, that could help a lot for others to believe you.