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Would you Add a Stress Relieve operation during the machining process to remove residual stress in the material prior to final machining?

I have an application that I have a 4" Dia. Bar x 14" long that I first have a hole drilled thru to remove material. I then send it to Stress Relieve to remove residual stresses in the Material. Will Stress Relieving help reduce the movement in this part during machining. I believe it will, but...

I have an application that uses ASTM 516, Grade 70 Plate. I can get it flamed cut to the sizes I need, but for large quantities, it is very expensive. Is there an alternative material I can use. Say the likes of 4130 Material in round bars. Would be cost effective if this were possible

I have an application that requires Cad Plating per QQ-P-416, Type II, Class 2. I have been getting different information about what my pre-plate Pitch Dia's should be manufactured to. My Post Plate Gages are Go Gage PD: .77719 & No Go PD: .76830. Looking up Calculating Pre Plate Screw Threads...