Addendum
In the above pots, I referred to a true count off +52, I was thinking here of +52 over "normal", which I think is 48 over pivot.
Regarding what KO in running count mode can detect: the highest RC is when all the low cards are removed, and all the big cards remain. Over a single deck, this would be IRC + 30. At such a running count, we have nothing left buts 10s, Aces, 8s, and 9s. We don�t know how many 8s and 9s are left.
Whether or not to split the 10s depends on the relative portions of the 8s, 9s, 10s, and Aces. If there were nothing but 8s and 9s left, you would not split. If there were nothing buts 10s and Aces, then splitting would have positive EV. If there only 10s left, it wouldn�t matter what you do, since you will push until cut card comes out.