I would keep at least 2 pins, one for 25 and one for 35. For me and my bow anything under 15 yards I aim an inch low and use my 25 yard pin out to about 28-29 yards. I have a 25, 33, 43, 53, 63, 73 yard pins. 270 fps
Nothing wrong with using one pin as stated but 2 pins makes lining the bow up easer than just using the bubble alone. With that fast of a bow and just shooting to 35 yards you should have no problems as long as you adjust your aim for long or short shots. You should really try shooting some long distance, it is not that hard if you shoot well and dam it, its just FUN!!! Plus it will make that 35 yard shot seem so much easer! I shoot 3 times a week when healthy and conditions allow and shoot out to 73 yards so I do more shooting than hunting hence all the extra pins. I am really contemplating a single pin adjustable set on 25 for hunting as the sight picture is much better and easy to compensate without moving it yet perfect for target shooting accuracy as the sight picture is the same for 10-80 yards.
Otherwise the one guy I know that shoots with one pin says its great and he only shoot out to 30 yards. He has taken many deer.
Good luck and try a 3D shoot they are fun especially with the right group of people!