As someone who knows someone who constantly do hunt trains and knows the enemies.

Well, there's no changes you can make. Base game and each expac has the A, S and double S set at max level for said base game or expac.

Till a certain expac can you solo. Beyond that tho you really can't and will laughably die. The only thing you can do is run with the trains or be in the discords/linkshells so you can get the mark.

Otherwise people need to stop crying.