RE: Puppy is busting birds...
It is definitely time to take training to the field. Since holding point appears to be your main issue, I'd work that angle. Your work at home should be reinforced in the field. Can you get your dog to hold point until released at home? If not, you really should work on that as it is unrealistic to expect the pup to do it in the field. Whoa, is whoa... and if your dog is not staying locked until released you just have basic control problems, very common in a 6 month old pup!
My suggestion is to invite someone else along to hunt, and you should focus on the dog. I am sure you bought the dog to hunt over, but allowing the pup to develop real bad habits now just creates more training challenges for you down the road. The time spent this year will reward you for many years to come!