I think will be a good idea to add a wind tunnel building, wich will allow to improve the cars. It will need a driver to test the results at simulator and the manager will make some decisions so the car will improve more or less depending on your choices and not just because the level of your staff.
Maybe a longer practice to decide the set-up will be nice. You know, you can focus on just some aspects, brakes, wings balance, qualify, race... so not everything will be perfect and the race will be more unpredictable.