Well, 50g of Caapi is about the lowest you can go and expect it to work while 10g of Mimosa is well outside what most would recommend. I would suggest using that amount of Caapi for four doses at most, and dropping the Mimosa down to 3-5g, at the most. Remember, you can always vape more if you feel there's not enough light.
Mixing them together is fine. You might want to mix them together, with a back up dose of mimosa to take at the 45 minute point if you're still not feeling much.
Vinegar works great, but you don't need much of it. A tablespoon per liter at the most.
Good luck!
Edit: Just to be clear, brew them separately and fridge decant the mimosa several times before mixing them.
PK Dick is to LSD as HP Lovecraft is to Mushrooms