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Another question- what's a good, but cheap, broadhead target? I only have a target for field points. I've seen Cabelas has one fairly cheap. I think it's yellow and it was around $40. Is that one worth the money?
IMO quality over quantity. I would drop weight to around 50 pounds and get the proper spined arrow for the poundage and work on your form and execution. Over time you will build endurance. Do that for a couple months then crank it up to the weight you want to hunt with and build your strength and endurance.
If your bow matches your strength and if you can shoot 100 arrows a day four times a week, shooting becomes instinctive. Being over bowed can hamper this. I think that if you're shooting a bow that will match to your strengths, this technique of muscle memory is extremely effective.