My training level is max, level 91 two seasons ago.
I have not deeply calculated the effect difference among world class drill and the others.

But I feel world class drill could save some greens.

Previously, my fast trained players always take 100 or slightly more greens upgraded from 100% to 120% (ie 6 stars to 7 stars)
Now, they take 100 or slightly less greens.
Extra position & 50 cone sa are similar. I spent within 50 greens.

Bascially, I don't think that my players are all the top fastest trained. Some should be very fast or moderate fast like previous seasons.