- Yes, position does metter, hero with most defense is always centar position or tank, specially healer. Flanks (gambler position) are mostly boosters or debuffers or heroes to give you ability like Brienne in your case. It’s ok to use all effecting attackers as well on flank. On wings people use snipers in your case Layla and Ulmer.
On wings tiles hits you the least so there is good chance heroes survive and do most damage to opponent.
The new AI introduced in last few months by SG from V20.0 is now focused on key heroes so when fighting against your opponent it will try to attack your flanks and wings more then center position. AI evaluates were it will get most damage per hit.
I would say it behaves in way that healers and hp boosters are not hitters and leaves them for last. I am not sure how it evaluates what hero is a key hero, but it surely doesn’t function as before when it focused on heroes with least HP or with full mana.
- Tiles or boards are random. There is nothing controlling tiles that you get on board, there are only good and bad boards. Most of us get frustrated when we don’t get good boards in a row but after some time it all gets back to good and you forget about does bad once. I also thought that there is conspiracy around tiles when I played mono teams and I get 10 boards in a row with almost none necessary tiles for mana boost. This is pure RNG. Combination of the boards is not manipulated.
Hope this helps you. Keep up the good work all will come, this game is very interesting and needs a lot of combining and knowledge to get in big league.