Carbons- non linear effects on dynamic spine; shaft length vs point weight?

[BAK]

Seems to make perfect sense to me, but then I never tune via length.  All my shafts are cut the same and I use point weight and side plate to do my tuning.  Makes for a consistent sight picture.

[ozy clint]

BAK- the footing gives you another tuning option while not changing the overall length of the arrow should you wish not to. change the footing length to vary dynamic spine instead of shaft length.

[ozy clint]

.......and if the footing is long enough that it gets drawn onto the shelf, it's like building out the side plate because the difference in arrow diameter pushes the arrow further outside center.

[Cari-bow]

Ozy is right the footing changed my impact. That's why I change things now so my subconscious can make the adjustments long before hunting season. In realty I've already adjusted but the reinforcement  over the next months will help.
Any ideas for the durability testing?

[BAK]

Tried the footings in length years back but didn't like the feel of the transition from shaft to footing.  No doubt it will increase dynamic spine though.

[ozy clint]

you don't like the feel of the footing being drawn onto the shelf? i know what you mean. when i glue the footing i make a 'ramp' at the rear about 1/4" long to create a smooth transition. makes it better for pulling out of targets too.