I'm using the Z2x regulator with the swivel & rubber hose that come with it. Last dive (and i've felt it on other dives), the regulator feels like it wants to pull itself out of my mouth (to my right) unless i'm really biting hard on the mouthpiece no matter how i move the swivel. I know a custom mouthpiece might help like a seacure. My guess is that the hose isn't flexible enough for me and i should switch to a miflex hose. (is the jam nut i've heard about a separate piece that has to be ordered or is currently part of the reg? ideally was thinking a 5' miflex with a swivel
The fix isn't to bite harder or change mouthpieces or get a longer hose. The fix is to fix what's making it pull.
The regulator port the hose is on needs to be about at the level of your mouth and the hose needs to come out of the reg horizontally.
The hose needs to be the correct length so that it enters the side of the reg, parallel to your body. If it's too long it will try to push the reg out forward, and if it's too short it will try to twist your head to the right.
The easiest way to figure out what's going on is to have someone look at you in the water.
A miflex hose will help, but might be an unnecessary expense. It's likely that your tank is too high or too low or twisted or you're using the wrong low pressure port on the reg or that your reg is mounted incorrectly.
Once you get everything lined up properly, the hose that came with the reg should be just fine, especially with the swivel.
Also, while "all the cool kids" have long hoses, there's no reason to have one on your primary if you're an Open Water diver, since you have no need to share air inside a restriction (you won't be in one) and there's no need to have to swim side-by-side while sharing air, since your training requires that you and your buddy ascend directly to the surface during an emergency like Out-of-Air.
There's nothing inherently wrong with a long hose, except that it will give you a bunch more hose to have to route and keep track of during your dive.
