| | Conditioning
You conditioning sounds like it's improving. However, don't expect that walking on a treadmill will improve it for you to be competitive at basketball. You are talking about anaerobic conditioning vs. what I would describe as low intensity aerobic conditioning.
Regardless of whether or not you want to play basketball or simply want to improve your conditioning, I would suggest you get a heart rate monitor. That way you can precisely tell if you are working hard enough. You should work up to a plan of easy and hard days. Hard days spend your efforts at about 80% of your max heart rate. Easy days will probably look more like your current workout. Try to keep your hear rate at 60-65% of max.
Alternate easy, hard workouts and take a day off after your hard. That should get you pointed in the right direction.