Application control methods to prevent jerky graph refresh rate

Hi all,
In the simplest terms, what I am trying to achieve is a VI with a button on. When the user presses the button, a subVI is executed which acquires some data which is displayed on 2 graphs. The first graph has cursors which can be moved by the user to define the limits of the data plotted on the second graph.
I created a VI that did the 2 graphs with the limits and they updated fine (see attached file Stiffness and Damping.vi). However, this was when loading some data from a text file (attached as LabTestData.txt).
When I replaced the loading bit with the DAQ subVI, when the user changed the cursors on the first graph, the range of data on the second graph remained unchanged (see attached file FIND SAD v1.vi).
I then changed the structure so the data acquisition was in a different loop to the analysis and this works to a certain extent, apart from the fact that the second graph has a very jerky refresh rate (see attached file FIND SAD.vi).
If someone has a suggestion on a better way to structure the VI to solve these problems then that would be a great help.
The second version also has the problem that the VI doesnt stop when the 'Back to main menu' button is pressed, and I can't figure out why this is.
Many thanks,
Ian
Attachments:
Stiffness and Damping VIs for forum.zip ‏240 KB

Thanks Tom,
I've attached it along with the subVI it uses as well
Cheers,
Ian
Attachments:
DATA FROM RIG v2.vi ‏553 KB
FRA SubVI.vi ‏71 KB

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