It has a lot more to do with the growing conditions more than genetics to produce tight buds. Sure genetics play a part, but as long as you keep your temps under or around 80 degrees during daylight hours and over 60 at night, and add C02 your buds will be fine.

Wait your talking outdoor arent you? Well then living in Canada your temps rarely go over 80 anyway dont they. Stinky's right you might not want them to be too tight with the type of weather you guys face in the fall.