It took me 2 weeks to beat this level. So frustrating! (I'm stuck on 67 now :( )
I hope this helps someone!

How I finally beat it -
First, find the rhythm of how fast the dots are passing the line up of the 8 you will be shooting. Count in your head to 8 over and over as each circling dot passes the dot line up.
Then find the pattern of the dots increasing and decreasing.
When to shoot the dot? shoot the dot when the rotating dots are decreased
Where? shoot immediately before a decreased dot passes the lineup.
Heres the Big Tip!*****This is where the counting comes in place. Now that you're counting in your head to 8, every time you shoot the first dot your count will be 1. Count and shoot the dots at the same rhythm. Counting and shooting til 8. The dots will pass perfectly as long as you keep the rhythm. Don't wait to see if the first one goes through. Tap/shoot to the rhythm!

Good Luck!