I hear what you're saying on the pitch counts and that's why I only bumped it up to 6 (and not 7, which seems to be common for many other sliders). I've been agonizing over this a little, but what I've seen hasn't made sense to me thus far.
So, I pulled the pitch count numbers from last year (Pitches/GS) and compiled the percentages:
<80 Pitches: 22.0% (TB with their tandem starter system averaged 63 in under 4 IP per start)
80-99 Pitches: 52.8%
100-119 Pitches: 24.9%
>120 Pitches: 0.2%
Basically, I've been missing that upper 25% (ie 100+ pitches) and based on the stamina drain rate, I don't think anyone under 85 stamina sniffs 100 pitches without being dead tired (the issue....only 10% of the MLB starters on the SDS rosters have 85+ stamina). Now, I don't think the roster ratings are off, and the scaling looks right, I just don't think the roster scaling quite jives with the pitch counts. That is what prompted me to go ahead and test out this adjustment. In my game vs Archer last night (and he was effective), he nearly hit 100 pitches at 84 stamina and might've broken 105, but that's it. That "smells right" to me and there are a plethora of guys in rotations with much lower stamina ratings in the rotations that will give that lower-end distribution and get those MRPs involved.
Anyways, not trying to argue with you or anything, but since I am home (and enjoy discussing these types of things), I thought I'd elaborate a bit more on the "why".
(To your other observation on user Ks....I only had 6 combined in my two games last night....so I was happy to hear you had a good performance)...when we see different things, that's very often a good sign of balance.
Anyways, going to fire-up some more games.
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