I did a little pattern drafting and some calculations and came to the conclusion that if you increase the finished size of each of sides of the cut pieces by 1.75 you'll get a quilt that is approximately 91" X 105". I used 1.75 because this resulted in cutting sizes that have fractions that are evenly divisible by 1/8. Otherwise you need to deal with fractions such as 3/5 and 1/3.
The attached pdf and gif show the cutting sizes as used in the pattern and gives the new cutting sizes for a 91X105 quilt. You'd probably need to test the snowballed ribbon end blocks because my version of EQ7 does not do snowballing. I hope you can link to this because I wasn't able to keep the formatting when I copied the table directly into the reply.