Hi Tassos,

The aileron computation is OK.
You might want to input the correct distance of the servo arm axis to control axis ( input Xs ). This will get you closer to your real configuration.

For the flap computation I doubt that your servo only has 50° of rotation for the whole flap deflection. You have correctly entered the control geometry ( Rc+=0, Rc-=45 ) however the servo might move from 40 to 40 degrees for example ( in that case you would have Rs+=40, RS-=40 )
Look at what you get on your plane and copy the geometry into the spreadsheet.