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Tijmen
The circumference of the bottom disc also has to be 28"
Once you have set the size of the tube it can't grow.
If you make the disc bigger you will just end up with excess fabric around the edge when you sew to the quarters.
Ideally you need to set the size of the disc as you want it to end up after completion. Then add your seam allowance to the outside of it, then measure the circumference. The tube is then that size, plus whatever seam allowance you want to close the tube on each end. Because you have a closed tube already, the disc can't have a bigger circumference than the tube.