Adoven
Percy and Vik both have some influence - but have already handed over their BPs for you to manage as part of V&A Shipping.
This page
http://rp.baileymail.net/lib/e...e:midmarchpeople.pdf has a list of relevant PCs and NPCs, their influence and as well as their allegiances. Although you need to remember that Percy is run by another player :)
Town Council
Adoven is correct that a sword school balances itself out (Economics 1; Loyalty 1; Stability 1 & Defence 1)and provides defence. However, he is wrong it that he doesn't need to get your permission. As the Town Council you authorize all building in Tusk. If you decide a building is not desirable for some reason, you could stop it being built.
Your immediate concern is liable to be where things are built - Districts can hold 20 building units (Note that some buildings take up more than one unit) Central has 12/20, Port Henry has 14/20, Merchant Qtr currently has 5/20. You should, perhaps, be moving away from too many new developments in Port Henry and central to allow the existing businesses to expand (Bigger businesses require more building units)
You have a high enough Stewardship Bonus that you could add two more districts to the Town outside the walls, and start thinking about zoning new developments or even moving existing ones - rather than just shoving everything into mechant Quaterter :)