1- When you sterilize your soil you are also killing all beneficial microbial life. If bugs are an issue I would recommend mosquito dunks ( See pic below)
2- If you know how to properly trans plant there are no issues.. I will state that starting in containers smaller then 32oz has shown signs of stunting for me.
3- With auto most efficient would be 2 -3 gallons in my opinion (I have seen monsters in 1 gallon and under)
4- If you water by weight you'll never go wrong
5- You nailed this one
With that said, be for you post your facts, be sure to make sure they are the facts....alot of new growers are gonna see this, and possibly get a slow start.