Bit Change/Reverse

So I have been trying to make some wall art items out of some old barn wood.

I am using two different bits. 90 degree for engraving and then 1/4" for cutting out the part.

My question is this… when you guys do a tool change how do you make 100% sure that you are starting back off from the original homing position?

On some of my engraving it seems like I need to rerun the job to clean it up but I cannot ever get it to home in exactly the same position and when I rerun its ever off so slightly but enough to mess up the engrave.

Also, I have heard that if you run your job in reverse that it can clean up the job but I am not sure if that is true nor how you would even accomplish that in Estlcam.

Here are some options and some tips.