Is CAE more difficult after 2015 update?

before 2[tel]% (60/100) allowed me to pass CAE with C1 grade
after 2[tel]% (180/210) allows me to pass CAE with C1 grade

Does it mean that is HARDER to achieve C1 grade?

I wouldn't trust percentages 100% , this can be misleading is for all I can say hmm ... mind the one thing , that you are always given some ' dose of uncertainty within those figures '