In the 2017 Major Leagues:
- 316 pitchers started at least 1 game, or 10.53/team
- 270 pitchers started at least 3 games, or 9/team
- 239 pitchers started at least 5 games, or 7.97/team
I wouldn't call it a "crazy" amount of injuries, I'd say you are experiencing what the average MLB manager needs to deal with each year
If you want to try to reduce the number of injuries to your SP you could:
- only use starting pitchers with normal or better injury ratings, maybe even durable or better.
- have a team doctor that is great with preventing injuries to pitchers.
- Maybe use strict pitch counts
- Maybe a 6 man rotation would help because pitcher would throw fewer innings.