A weak starter could have trouble also a weak battery or poor ground. Do you know how to do voltage drop test? 10:1 ratio shouldn't be an issue lots of engines run that or higher N/t's of course. I am more concerned about the play you have the starter bolts in horizontialy the only thing that lines it up is the nose of the starter and tranny case. Maybe the case is worn cause you say a different starter from a diff car did the same thing.