Sounds about right from what I recall just a few days ago.
I was getting about 1% or just over 1% at 91->92 and 92-93 was .9% and 93-94 was .8% each scroll. Given these are rough estimates, and I didn't look at xp tables to see if it was correct, but your numbers do sound reasonable from what I saw when doing my sub earlier this week.
If the level really only requires 27B xp tho..dafuq