bareshafting is important and honestly overspined should put a smile on your face because now you can double that point weight,, when its underspined thats when it really stinks.
bareshafting is not critical to make a good hit where accuracy is,,, bareshafting is only critical in utilizing every bit of your bow set-up and your arrows energy,,, ALSO bareshafting is also nice because once perfect flight is achieved you can then use any broadhead vs any fletch and if you get rained on and your 5.5" highback shields lay down flat you will still get perfect flight even with a huge 2" broadhead.
I just bareshaft tuned some heritage 90's to my new used treadway blackforest and now its set up with 2" wide treesharks and 3 4" parabolic feathers and they fly like lazer beams..