Springstay location question

[mariner2k]

And humor you I shall! On one of the angles I plugged in the wrong value. On the other I took a more careful measurement and the angle was actually a bit less.
So the angle from the mast to the chainplate turned out to be 14.5 degrees. The angle going on a forward plane is only 4.09 degrees.

Numbers are as follows:

Mast height to connection is 286"
Center of mast to where chainplate meets the deck is 74"
That angle should be 14.5 degrees at the top.

On the other:
mast height to connecter is 286"
going directly forward is 20.5 inches.
That angle is 4.09 degrees.

Disclaimer: I haven't done this in a few (35+) years I could be wrong.

Would I be correct in assuming that lower shrouds aren't design or located to support a mast fore and aft with any significance?

Thanks, Kevin