Major Leagues World
HBP/Team
S13 - 58
S12 - 57
S11 - 58
S10 - 57
Major Leagues RL
HBP/Team
2010 - 52
2009 - 53
2008 - 58
In 2010 (a low mark for HBP), the average team was hit 52 times and logged 5512 AB and 526 walks, for a total of 6090 PA. They were hit by a pitch .858% of the time.
In S13, the average team was hit 58 times with 6284 BFP. They were hit by a pitch .827% of the time.
Don't tweak a damn thing.
For one thing, the HBD engine isn't something where you can simply isolate a given number and tweak it without impacting anything else; we know that from experience. So this isn't a simple change and all the ramifications would have to be considered/tested first; we know from experience this isn't always done properly.
For another, it's nearly perfectly on point with real life already, and that's without allowances for the different things we do in HBD than in RL (e.g., some owners here let Rick Ankiel keep pitching). Even if the tweak were simple, this isn't something that is out of line.