Judge not the actual numbers as my switch requires a lot of pressure to activate so it actually pushes the glass, and pcb, in and repeatability is out the window. This is why I have a new switch on the way (a mouse kind) that is ultra soft touch in comparison. Now do judge the sign of those numbers and considering I let the bed tell me how it wants to go instead of me trying to force it to bend to my will that is the best I can get it with a 4 point Prusa I3 Aluminum build.

As far as homing goes if I hit the middle button that homes X and Y the bed comes full forward (to hit the Y max endstop) and full right (to hit the X max endstop).