They didn’t have a scoring system change when they began working under Orser.
Zagitova had 239.57 in 2017-18 and 238.43 in 2018-19.
Miyahara had 222.38 in 2017-18 and 219.71 in 2018-19.
Sakamoto had 214.21 in 2017-18 and 213.90 in 2018-19.
Tennel had 204.10 in 2017-18 and 206.41 in 2018-19.
Tursynbayeva had 200.98 in 2017-18 and 200.74 in 2018-19.
Then Medvedeva: 238.26 in 2017-18 and 204.89 in 2018-19.
I'm sorry, I was mistaken, it was a whole 30 points drop

The scoring system change changed pretty much nothing for the ladies in terms of the overall numbers.
And Hanyu finished off the podium at Worlds his first season with Orser after taking bronze the year before.
2012 Worlds, Hanyu scored 38.68+38.39 in SP and 91.99+83.00 in FS. That was his best performance of the year.
2013 Worlds, Hanyu scored 36.12+40.82 in SP and 89.05+80.00 in FS. That was his second worst performance of the year.
Difference of 6 points, not of 35.
Hanyu's scores in 2011-12: 226-226-241-245-251
Hanyu's scores in 2012-13: 248-243-261-264-246-244
It obviously looks like his performance had a major drop once he moved to Orser. Lowest score of 243 vs 226 in 2011-12. Highest score of 264 vs 251 in 2011-12. Average of 251 vs 238 in 2011-12.
If you need more numbers, I can bring them.