You can increase or decrease %s based on the skills and equipment your commander possesses.

The % values of the traits for each piece of equipment affect the bonuses of the town. Look through each item: hat, coat, shoes, etc., and equip other items from other commanders as needed to improve the town bonuses such as various resource production, research, construction, etc. As you make a change, return to your fort and check any changes to the town bonus %s. Did make improvement? Great! If not, try a different hat or gloves until the values provide the improvements you want.