I was just about to post the same thing. I have the exact same problem. I think the twists may be my problem. I wear mini twists a lot and I think I lose a lot of hair with the process of putting them in and tangles from shed hair when I remove them. My new plan is to add protein to my regimin to stop breakage and wear twist outs (twisting every other night). Not sure if this will help with retention, but I have to change something. I know my hair will get more moisture but I don't know if it will be too much manipulation. Basically I wrote all of this but I have no advice.
Originally Posted by newtress10
The shed hairs in protective styles give me knots and tangles too. I left some twists in for 4 days recently and it was so bad I had to get my scissors out. For my hair under manipulation is more of a problem than overmanipulation.

Like other have said it's trial and error. But babying your ends goes a long way for retention.