7.9 feet equals 13 steps
9.9 feet equals 17 steps
I do not have a number for 8 feet exactly, but you can tweak the 7.9 figure to meet your needs, but this does say that 13 would be the number for 7.9 so your 11 is too steep.
I would think that 14 steps would be the ideal situation for comfort and being used to.
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