IF you have a religious preference, pray/give offerings to whatever god/saint/mystic puffball etc. has good fortune in their portfolio.
If you're an atheist, you're on your own.
But, seriously, if you're enhancing for luck, try to have the piece have as low physical resist as you'll be able to tolerate. After all, that +5 to physical from the spined leather is a pretty difficult enhance check, just by itself. Going from 2 to 7 or even 5 to 10 might be fairly easy. But trying to enhance it from 17 (fully imbued) to 22 is nearly as likely to make it break as the adding 40 luck to the imbued 100. (going from 100 to 133 intensity, for the resist, compared to 100 to 140 intensity for the luck)
For resists:
If energy is the highest resist on the item, you're probably better off enhancing with horned, to reduce the break chance on that check.
If fire is the highest resist, you might be better with Barbed leather.
If both are at max imbue level or higher, it's your call. Both are likely to break.
If the item has high resists in all EXCEPT Physical, and has little or no luck, you might actually have the best enhance chance with Spined!