As for Postworkout: you should always try and get in most of your carbohydrates in this way. The reason being that postworkout your body will put these nutrients into the muscles instead of fat cells.
If you’re following t-dawg 2.0, I believe 70g of carbs should be taken in after your workout. Since the interval training is less exhausting I’d eat less afterward.
The simple fact is that the “safest” time to eat is for about 90 minutes post workout.
As for question 2 I am not really sure. On the one hand, the lactic acid is supposed to elicit GH which helps you lose weight. It also helps you burn calories even after you are done working out. I’m not sure for how long the lactic acid actually helps you lose cals before it just keeps you sore.
I’m guessing that if you did something like weighted GPP at night, you’d be good.
As for how well it works, I’d say that depends. Some people have had great results, some just got really sore. I tried and didn’t find it to be anything spectacular. I never got to the point where I was fermenting lactic acid, hence I never got good results.
If you’re interested in weightloss regimens go to the FAQ or search for EDT.