Dynamic Spine Cal...help!!!

[metsastaja]

I have found all bowyers are willing to give you center cut if you call them.  It is usually worth the dime to be certain and can make tuning easier.

[wtpops]

How long are the hit inserts?

If im not mistaken the calculator has built into it the lenght of the average insert, because when an insert is glued in that lenght of the arrow becomes non flexable therefore taken out of the arrow lenght. Example if your arrow is 30" and the HIT insert is 3" then your arrow is in effect only 27". Just a thought.

[metsastaja]

From Stu's Calculator Directions for inserts longer the 0.9"

Footing

If an internal OR external footing is being utilized then select "YES" from the drop down menu. In
the boxes below enter the length of the footing in inches and also the total weight of the footing.
- An example of an internal footing would be any insert with a length greater than 0.9"
(std. insert length). In that case enter the amount greater than the 0.9" that is already
accounted for automatically.
- An example of an external footing would include be an aluminum shaft glued over the
outside of a carbon shaft. In the case of an external footing enter the total length and
actual weight.

[hkmp5]

Hello Benny,
I think the issue here is the HIT inserts.  Take a look at the instructions about internal footings.  Turn on the footing option and enter the length of the HIT you are using.....I think things will become much clearer then!  Also, use the 5" feather option as this will be closer to your 4x4 weight.  
Those two change will significantly increase your arrow spine.  
I look forward to seeing how closly it predicts your results so keep us posted!
-Stu