Yes, your numbers are correct and are those recommended in the manuals. When I was working with 727s (30 yrs ago…) it was company practice to move the start lever at max N2 attainable, so as the FSS 727 always goes up to 25% N2 I use this number. We also had auto starter cutout at 35% (as the FSS has) but you had to be aware in case the auto didn’t work to move the switch to off at 48% max, otherwise the starter was toasted. That’s why I remember this number 
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