dear lil new member.if you know how to use CE means you have an idea about programming.well you should also know that ALL alchemy/craft succes chances in any game is a result of a instruction named "random".that instruction is a code written into the game files and server database.you cannot change the succes rate.
this is also valid for the rates of SP,exp,drop and much more.
glad to help you out.
hit the thx button if i helped you