*cough* they are all the same thing*cough*
they are all dow 33, why do you think sl33k has 3's instead of e's, the only difference is if you buy shocker lube that is called "shocker lube" it is pink not white.
dow 33 is reccomended for all spools and all SP guns, there is usually a big whooha about how it voids your waranty to use anything else but i dont know if there is any truth in that. just use dow 33 and you will be fine, im also working on ways to solve fsdo with shockers, if my cunning plan works ill be impressed