With a 340 spine arrow you could adjust you're weight up some and still be in spine to maybe a little light. The increased velocity would help. At 60 you could also move up to an arrow more around 450 to 500 grains, which is good.
As I have gotten older and 60lbs hurts the joints, I miss it, I have learned how to maximize 50 to 55 lbs to be effective. But I would shoot 60 tomorrow if I could shoot a lot and not hurt. But it is more important to me to shoot a lot, thousands of arrows a year. I could turn up to 60 just to hunt, but since I shoot all year and tune everything this way I hunt that way.
A higher IBO bow someday will help, the PSE singer is around 310 fps IBO, okay. But at a long draw, a 330 IBo or better with a sharp cut on contact and 450 grain arrow, even with 50 to 55 lbs,you can go hunt whatever you want , and with a good shot expect to kill stuff without much reservation. Besides the heaviest stuff. It's always about a good shot though, a good shot is a good shot and a bad shot is a bad shot. Good shots almost always work out good, and a bad shot ...well...you get lucky sometimes. Mostly , if you make too many bad shots, it just makes you sick. Stay within you're limitations, shoot and shoot so you have a lot of confidence, focus when the moment comes, stay calm, focus, do what you have been doing all year in practice. Get the range right.