Although it seems to counter logic, a high rejection rate doesn't mean you're doing anything wrong or missing some kind of detail. It means there COULD be something wrong, sure, but it can still happen even if everything is fine. If you're getting 8.5MH then you should pull 34 VTC in a day. If that's what you're mining, you're fine.
Gotcha. Thanks. I appreciate it. I ran a couple speeds tests and noticed I wasn't getting what I was supposed to so I called my ISP and they did something but wouldn't tell me and that brought me back down to a normal range, still higher than I'd like to be but better. Thanks again.
Try changing the wireless channel if you are connected wireless. Perhaps one of your direct neighbours is using the same channel. i'm getting a reject of max 5% on my node connected via wire.
Wired connection is best way to stay away from connectivity problems. Some may find it is not practical due to distance or obstacles then only have wireless option.
Sometimes the wireless receiver also plays a part if it an external usb receiver.
As Kartoffelknilch said you need to think about what channel you are using if using 2.4GHz range coz there are only 3 non-overlapping channels (1,6,11) and in a scan if many people utilizing the same channel (ex. 6) use a different channel in your setup (ex. 1 or 11).
Best way is using 5GHz range since there are many non-overlapping channels and low noise/interference from other sources.
All above can be a reason for connectivity and therefore rejections.