The S is notoriously inconsistent at #88 ranging from 50 - 64 mm (that I've seen). At 64 you can break strings unless you modify the tuning curve down to around +30-32 cents at c88. Changing the gauge won't help. Lower gauge requires less tension but then has a lower breakpoint.
If you're installing a new board you can just move the bridge forward slightly. If not you can sometimes recap the top section and move the bridge pins forward. While you're at it you can create a logarithmic progression in both capo section which is helpful anyway. That's usually how I approach it. The log scale can be done on excel.