Threat issues brew

Hi!

I started playing my brew for a change of pace some two weeks ago. So far ive done most dungeons in 11 and a few in 12. But ive run into a problem when i with more experienced players. I often lose threat and fumbling to get it in the first 10 seconds of a pull.

I usually open with keg, breath and ek as im gathering. But its still just so chaotic. Any tips?

Dps wise i push around 1 mill overall in a dungeon as 630 ish.

Edit: my monk is nomedigas on runetotem if yall want to check it out