Got my new recurve in today. thought I would bare shaft my 150 heritage 29"  had a 100gr insert 175 head shooting tail left. change head to 125 gr still tail left. Took out 100gr insert put in the lite weight insert 125gr still tail left I am pulling 28 ''

How do you bareshafts group compared to fletched?

hits left/flys tails left

More information is needed here. Are you right handed? Is your bow cut to center or past center? What draw weight is the bow? It's possible that your shafts are too stiff and are hitting the riser, especially if it is not cut to center. I had a similar experience with a "50s style" recurve that was not cut to center. I had to use full length shafts with heavy tips to get the arrows to bend around the riser. Since lightening your tip, essentially stiffening the spine, didn't help, I'm guessing this may be your problem.

If you have an uncut shaft, load it heavy and give it a try.

Hope this helps.

Russ

right handed Blackwidow recurve 51#28

Shounds way weak if it is a MA or SA type cut past center a ways.  I don't know how they cut the SR.  I don't know about the shooting left part, but tail left sounds weak and by everything I have seen that arrow is under spined.  You could try 100 gr. point and standard insert, but you have to watch the arrow weight to bow weight.  I think you are getting right down there near 8 gpp. Also try and build out your side plate some to check and see if that gets it.  Then you will know without messing with different arrows.

Right hander grouping left is a stiff arrow. The nock going left can be caused by form and isn't a good indicator for most shooters. If you back up and the groups go further left then the arrows are stiff.

leave the arrow 30" and put a 145-175 on the tip. thats the same configuration i shot out of a similar poundage bow.
 and another thing. this may sound crazy. turn your cock feather in and shoot it 10 shots. see if it straightens out. if i get a new batch of arrows and they shoot a little stiff or weak. i flip that sucker over and they fly. dont know how this works. but it has worked for me countless times.

v13 has a good point. Are your too snug on the string? Change the brace hight, and see what happens. Make sure you are not torquing the string.Bare shafting can be misleading if you are not near perfect on many things.

Are your nocks too snug on the string? is what I wanted to ask.