1°) Yes, leave the TaT before the A check.
Leave the
minimal TaT before A-Check. For example, I'm playing with S2000s currently, with most my A-checks from 0020 to 0520. My first flight of the week takes of at 0520, and my last flight of the week lands at 2355. which means 25 minutes. The minimum TaT of S20000 is 25 minutes. All my other TaTs of the week are 40/45 minutes.
For the rest, I don't think I need to answer, you did it perfectly.
Good idea, but probably not for 21st century.
Boeing 767-400ER variant that exists in this GW does not make it in the reality. I don't like to use airliners that does not exist. The development of B767 is quite old and considered inefficient these days. Airbus A330-300 might be an option, but only if NEO variant would be used, which is comparable to A350.
I'll pile up with Tha_Ape, there. There are some potential planes that help a lot. In some circumstances, Fairchild-Dornier 928 are really an excellent choice(even though in a majority of cases, the Ejet will be superior). in many circumstances, the 764 ikicks ass, until the advent of the 788.
I've mentored a few dozens of players, and those who failed to thrive in the game where either completely inept(which you do not sound to be) or were/are blinded with their real world mental image. AWS being a simulation, to play it as its best, you have to play it as it is. It's true also for demand. for example, IRL, BVA-PIK makes no sense to fly. OTOH, in AWS, it's rather a nice destination. If you block your mind to what you know of the real world, you won't be able to play efficiently AWS. AWS is its own reality, which one has to assess as it is.
Said otherwise, B764 is a real thing in AWS, and you'd better take it into account, because if you don't, your opponents will. If you can fill it on a 3000-5000NM route, it's really a good, good, good plane. The best until the even better B788 arrives.