Thanks for sorting these bits out.
Grace

á fárra manna viti (dat sg of vit).
within few persons knowledge

"Eigi mun oss enn duga kyrru fyrir að halda.
'(It) will nevertheless not help us not to stir (see halda fyrir kyrru,under
kyrr, Z1).

nema hann setjist aftur.
unless he desists (from travelling) (remains back, see setjast aptr, Z12).

Fred and Grace Hatton
Hawley Pa