idk, man, seems like you probably gonna have to gouge out the concrete to let you drop the pole a foot or more into the base to make it work
Discussion
every time i hear impact drills on concrete and jackhammers what my thought is these days "this is people building without an architect, pour concrete, lay bricks, then think, oh wait, i need to attach this other thing"
how in the hell do you get to putting foundations in without a plan for what is gonna go on top, may i ask?