my go-to brine is by weight, which eliminates a bunch of issues:
* 400g water
* 26g salt
this makes for a great brine without trying to estimate or "taste" it to see if it's ok.
in addition, I sometimes use adjuncts:
* garlic - this adds a lot of flavor to the sauce, but could add yeast if you're not careful
* carrots - adds some vegetable flavor and a little bit of sweetness without adding sugar directly
I also don't pasteurize it (heat it up after it's done, or add vinegar), since I prefer the natural change that the sauce has over time. I also don't "thicken" it, you can get a better sauce by using the correct amount of brine when you go to blend it at the end, if all else fails, any leftover brine can be used for other things (I have some great pickles that were started with a partial batch of brine).
it's a fun hobby, but make sure that you can find a home for the extras if you aren't an avid hot sauce eater!
editing to add some tips:
1. if you're dealing with hot peppers, use gloves - they help a lot!
2. the seeds and the pith add a lot of heat - you can remove them and get yourself delicious flavor without the pain.