I would suggest using 14mm tips instead of 13. That would have prevented the red dye on the outside of that Sumo from getting into the ferrule, and the tip, once to size, would be a uniform chocolate color instead of splotched with red.
Ivorine is a good material but pitty. KJ offered up a sure fire way to prevent the mess in the future. Changing to another material is not going to help you learn anything, only avoid it. Using Juma or whatever else on the sole basis of aesthetics is not the way you want to start your cue repair endeavor. At some point somebody is going to ask you to use a hard hitting material, or will outright ask you for a melamine material (ivorine, aegis, etc.), and then what? Are you going to tell them no because you don't know how to use that material? You have nothing to lose by learning, except the cost of some material. But that will be far outweighed by what you'll lose if you send out a shaft looking like that or refuse to use certain materials because you don't know how.