My experience of mixing is from the '80, when weed was weaker and acid stronger. "Don't mix weed with acid, you're just wasting good marijijana."
lol, you're missing a key point here buddy: you smoke weed. That is why eating trees will get you a lot higher; you're losing cannabinoids when you smoke it. BUT we don't smoke mushrooms, we eat them. Hence, the psilocybin in them is all absorbed. Drinking OJ is a PLACEBO. If you think OJ is going to introduce you to god and believe it enough when you're tripping, IT WILL. Mind over matter.
So does powdering your shrooms and drinking it down quickly on a empty stomach. Its just absorbs faster and more completely that way. Vitamin C or soaking it in lemon juice does not make it or mean it become more potent. If 2 grams contains 20mg of psylocybin, nothing you do will turn it into 22mg's Short of adding another gram of shrooms.