Hi Daz,
A few ?? I'd ask myself if it were my problem.....
Why calibrate every time, does the calibration appear to change? Does the clibration appear solid or are things jumping around?...If so could be a joystick problem.
Try 1) increasing the 'null zone' in joystick sensitivity settings, or 2) remove your joystick rudder from assignments and use 'autorudder' from aircraft/realism. ( then use ailerons to taxi) or 3) disconnect joystick and fly with the keyboard. Any or all of these should help to verify if it is a joystick problem.
Are rudder and aileron trim (if any) centered or in TO position?
Do you have a cross wind? shft/z to check wind direction and speed.
Aircraft/realism (for left turn tendency) should only affect props, but you could try setting to easy.
Autopilot off?...(I know, but gotta be asked

)
Low tire pressure or chock still under left wheel?
At that time [1909] the chief engineer was almost always the chief test pilot as well. That had the fortunate result of eliminating poor engineering early in aviation.