I took a look at your tree because my great-grandmother was also born at Instanes, but we are not related.
I see that you show "Lars Arnesen Jårstad" as being born in 1799 and do not name his father. this may help:
Married 13 Nov 1834 in Ullensvang
Lars Arnesen, 30 years old, son of Arne Torgylsen
Britte Johannesdatter, 30 years old, daughter of Johannes Trondsen
Kildeinformasjon: Hordaland fylke, Ullensvang, Ministerialbok nr. A 10 (1825-1853), Ekteviede 1835, side 236.
Permanent sidelenke: http://www.arkivverket.no/URN:kb_read?idx_kildeid=11718&...
Also, on page 424 of the Instanes farm records, it does not say:
Here it is recorded that Brita Johannesdatter Instanæs was "married in 1834 to Lars Arnesen of Jarstad who lived in Tysnes"
Brita "married Lars Arnesen from Yttre Jåstad and they later MOVED to Tysnes."
I can not find Arne Torgylsen in the 1801 census, but I do know there was an Arne Torgylsen born in Ullensvang in 1872.