I have a 13-1, the blue version of yours, and I have followed many many threads on the "full power" cracked forcing cone issue on the 13 / 65. My take is there are more emotional statements than factual statement; of the hundreds of comments by many I have seen one photo of a cracked forcing cone, and no one can actually state what the "full power" line is that cannot be crossed, or what round count is the max allowed. You can read all sorts of general comments, but no one can actually state the maximum fps of a bullet as being OK or too much, mostly due to the fact that there are only a rare couple of actual cracked forcing cones reported or remembered. For example, I saw one set of comments where someone said that the Double Tap 125gr 1650fps was too "hot" for the 13 / 65, then someone pipes in that "in the old days that would be considered 'average'" or something to that effect. One can find many opinions, but few facts. Here are the warning statements regarding cracking the forcing cone:
"Shoot only 158gr bullets"
"Stay away from the "full power" 125gr loads" [full power being anywhere from 1250fps up to 1700fps depending on the comments]
"The 125gr bullets are smaller thus allow hot blow-by gasses to overheat the forcing cone"
"110gr 1295fps Winchester is OK" (and 158 is also, but not 125??)
"today's loads are milder than we had years ago. Shoot anything you want."
"the cut on the bottom of the forcing cone on the 13 / 65 to clear the cylinder, that is the weak point."
And of course you get get comments like this:
"I know a guy who has a cousin who knows a guy who shot a verified 20,000 rounds of "hot" 125gr 357 and never cracked his forcing cone."
It goes on. The 13 was an FBI choice for a while, I guess if the cracking forcing cone was a big problem we would have heard a lot more about it. Likely the reality is that like anything mass produced you can get an few from the extreme end of the tolerances of the mass quantity that may have a flaw. I am sure that all the comments originate from some factual but not readily available evidence. That said, now you cannot get replacement barrels for the 13 / 65, and I like my 13 a lot, so personally I err on the side of caution.
Based on assimilation of all these comments, I have my own guidelines:
Shoot 38 and [mostly] 38 +P 158gr at the range, and one or two cylinder loads of 357 158gr to remember how much a 357 kicks.
Clean it well after each range visit, especially the forcing cone area.
Right now my 13-1 is my bedroom gun, when it is in the bedroom and when I infrequently carry it, it is loaded with 158gr 1250 fps hollow points.
Enjoy that trigger, I don't think you can customize anything to match it.