Flight 1 Duration rockets feel like flight 3 duration rockets and can't control Elytra very well due to loading issues

I cannot control my elytra due to loading issues, I had to relog for them to load properly which didn't help. I use flight 1 duration rockets, but the game thinks it's flight 3 rockets and just tries to kill me even though I got keep on inventory. I get a lag spike = elytra flies me without using a single bloody rocket

Here's my evidence. 
https://www.youtube.com/watch?v=SHSmquLZxc0