Bluntly, buying a narrower width than you need and relying on punching to make it fit is a terrible idea and I would also find another tech if that's what this person is suggesting. Punching and stretching are unlikely to result in major adjustments.
My experience with Riedell vs. Jackson is Riedells have an even wider heel in addition to the narrower toe and will likely compound your problem. My experience was with stock boots; customs may be a whole different ball game. I also did not find SP-Teri to be very good at the wide toe/narrow heel thing when I got their customs, but I have many other foot problems, so YMMV. They also may change with new ownership; the new owner was intimately involved with my boot saga, so he knows how much SP-Teri did not work for feet like mine!
I also second the suggestion that you may have broken down the Jackson Elles. Granted, I weigh rather more than you, but my Jackson Premieres, which are something like twice as strong as the Elles, started breaking down at around 18 months and were totally done for at two years. I got them when I was learning toe loop and salchow and kept them through some loop and flip attempts, and was skating about 3 hours per week.