Sorry, no idea about the PC version, but try the sliders above, see how it goes and adjust accordingly. These sliders do seem to reduce the pitch count, so you may find starting pitchers stay in the game longer. On those sliders so far the hits are a little high, but it's only a small sample so far and the White Sox have spent two games whacking the Indians all over the place. I just tried a game with those sliders but made the following tweaks:
Pitch success @ 65
Strike zone freq. @ 55
Break influence @ 20
The Red Sox beat the Indians 4-1.
Hits : Sox 12, Indians 8
Ks : Sox 10, Indians 9
BBs : Sox 4, Indians 2
Avg : Sox .342, Indians .250
Gonzalez had a HR for Boston, 1 error for each team. Lester pitched 8 innings, had 8 Ks, then Papelbon came in and struck out two more in the 9th. Carmona was yanked after 4.2 innings. The pitch count was better with these adjustments. Good pitching means the starter should go deep, bad pitching means some sit down time.
I think the main problem with trying to perfect CPU vs CPU sliders is precisely that, trying to perfect them. This season offensive numbers are down, so as long as your stats are 'believable' then slightly up or down isn't a real problem. As long as hits and strikeouts don't average too high, there are enough HRs (1.8-2.2 per game combined), and batting average is around .240-.260 on average and BBs average about 3 per team per game then it's close enough. You just have to imagine that your franchise/season/playoffs are in an up or down year in terms of particular stats. It's unlikely that only one will be way off, I would personally favour slightly lower offensive numbers than the other way round as long as HRs are at realistic numbers, that way the weaker teams shouldn't be overwhelmed everytime they face a power hitting team. Try these sliders with the tweaks in this post, and see how you go. Good luck.