Being a heavy smoker I don't think I would even bother to try and get clean in this short of time. I'm 6'1" 280 lbs and it takes me about 3 weeks to get clean but I've seen others that have taken 4 to 8 weeks to get clean.
1: Metamucil will work better.
2: Jello method is pectin which does basically the same thing as metamucil.It keeps your colon scrubbed out which doesn't allow the thc metabolites to be absorbed and passed through the urine.
3etox drinks rely more on dillution than anything else I think. I don't like them because they are risky. To high of a failure rate.If you had time and could afford to buy a few bottles and experiment with yourself then it might be worth it.
But why? QF works a 100% of the time and the temp is easy to work out. Spend a couple days practicing with the QF. Keep the temp between 90 and 100 and you'll be fine.