Animator issue in bullet hell game

Hi, we making a multiplayer bullet hell game. There is several bullet patterns or bullet scenarios, dont quite sure how to call it. Here is a quick example:

Bullets are created with Instantiate function and they travels in a strait line. Bullet generator is animated by animator controller for rotation over time left to right, player is standing still. And there is the problem. Sometimes for example, player get hit by 10 bullet, sometimes by 11 or 9. The number is not always the same and i think it depends on lag and fps.

How i can make it constant? Even if PC freezes or lags, player will get hit by 10 bullets every time.