I don't see a problem with +P ammunition in a gun designated by the manufacturer as safe for +P use. I do think going to +P+, or +P loads in calibers not listed by SAAMI as having +P standards is getting into the area of Tim the Tool Man Taylor. Uhm, Uhm, Uhm, more power! And if you watched the TV show, you know what usually happened to him!
If you just don't have confidence in the power of the gun you have, it's time to get something larger. Probably not really necessary, but if it makes you feel better go for it.
Cheapshooter's rules of gun ownership #1: NEVER SELL OR TRADE ANYTHING!