Speed doesn't make you shoot any better. It just covers your yardage mistakes. 346fps really too quick and makes yardage judging less critical. In fact, slow bows are a lot easier to be accurate with. Look at what serious dot shooters are using. Some of their setups are below 200fps. It's that way for a reason.
You need to get out and shoot as many 3D courses as you can.
I can tell you this much, you will see a TON of people who dress, act, and talk like they can shoot at ASA's but you will soon figure out, who can and can't shoot. I think it's quiet comical actually. I would post a picture of a guy that actually made me LAUGH when I saw him and then saw him shoot but I would hate it if he saw it
You will also see people who shoot VERY well on the known yardage part. Which usually isn't me. I just don't make as strong of shots when I know the yardage. I shot a 206, 6 up on the known, and then 10up on the unknown, go figure.[8D]
EDIT: Also, don't get caught up in 14 rings. They don't help that much.