Can anybody help me???

[Builder]

With what your telling us those 150's should be spined about right. I'm shooting 50
#'s out of a Widow with the 150's and 2117 alum and they both fly very well.
I think it may be in your nock (too tight), release or possibly drawing too far and brushing  your clothes somehow. You may want to try opening your stance a little bit.

[Rock Crusher]

Thanks for all the advice and ideas so far it gives me something to try.

I've got my nocks sanded open so they fall off if I tap the bowstring sharply. Thanks for all the help.