town security

I just gained a town settlement in my game play and I am having some trouble understanding it after playing it for a few days. First of all, regarding the question of security, I thought the perk Mounted Archery from Archery line is supposed to give 20% more value to the archer type garrison...

Thugs in the backstreet for example appear to be way to strong. This very very cool feature is a little ruined by the fact that the player cannot move in with the same amount of fighters to get rid of them, but only with two companions who get surrounded and slain instantly (even with the most...