My main reason for using 158 LSWCHP's (or 158gr anything else, for that matter) is penetration. They also often shoot to POA in fixed-sight revolvers. I think that they are a safe choice, +P or not. However, if the 125 Gold Dots hit the target where you think they should, you might see whether you can find some info from Speer on how they perform in testing following the FBI protocol, which I believe is a pretty good test, weighted reasonably towards penetration. My recollection is that most Gold Dots were successfully designed to pass that test.
Myself, I carry 158gr LSWCHP +P from the Big Three in guns for which the manufacturer sanctions it, and standard 158s in the aluminum J's.