Below is a Zwickey No Mercey and Delta both with different furrrels an yet both are the same in adapter showing. The difference can be seen by the thread length post.
And, we have a Suffer and Woodsman with the same different adapters showing more adapter showing.
I have no worries about any of these heads/adapter combos. I've killed a lot with the Snuffers and Woodsmans with no issues with the adapter showing more. However, that 1st pic you posted Zing is a little concerning as the gap is narrower and exposed. It is the weak point on you arrows.
The Suffer is a bit dirty because it was given to me by Ryan, and I killed a nice javie with it last Laredo hunt and I retired it.
![campfire :campfire:](https://www.tradgang.com/tgsmf/Smileys/tg/campfire.gif)