Have had great problems with 'testitus' myself.
One night, howling crosswind, viz nil, bumpy as
and I had the ils nailed to the centre of the HSI.
Next day, 8/8ths sunshine, no wind, bird tweeting, examiner in the left and I couldn't find the same ILS into the same airfield for toffee!!!!
Sod's law really. You try so hard to prove and impress that the situational awareness goes out the window. I have also seen exactly this in students.
Best solution, become a train driver, no seriously.... relax, chill and enjoy.
W2P