i played on a friend's level 99 pure int s/s, and it failed so bad going against any full str that use vigors.... especially chinese because of no pot delay, they didnt even use snowshield shield... i was going against level 100 (or around there) full str bower, he was using vigors, the battle went on for more than 2 minutes, i cannot kill him because he healed faster than i can damage him because of vigor and kb, and he cannot kill me when i have snowshield and/or the ironwall skills on, so after about 2-2.5 minutes, my snowshield and ironwall gone and on cool down for like another 30sec or so, and that's when i died to him, wasted so many gold on pots because of long fight and in the end always lose, i didnt use vigor, if i do, i might last til snowshield come back and use it again, but that would be a horrible long battle, beside he can pretty much kill me with a crit when i dont have ironwall/snowshield... so if i were you, i would think again about making a full int...
and the build that i suggest is 100bich/100light/100cold if u really want to make one... at least it last longer than spear

block helps a lot! (but spear might out damage the pot+vigor healing, havent try spear)