Sounds like you are on the right track.
There is another couple showing in the censuses, Alexander and Barbara Fraser living in Kirkhill. From 1861:
Alexander Fraser 46 general lab b. Kirkhill
Rebeca Fraser 40 b. Kitarlity
Betty Fraser 16
Jessie Fraser 14
Ann Fraser 12
John Fraser 10
Christina Fraser 6
John Fraser 2
Address: Millifiach, Kirkhill, Inverness
Can't make out from the FS birth index what the maiden name of the mother Rebecca may be
At the same time, you have the family with Hugh in 1861 (you have this but just for more info here):
Alexander Fraser 36 agr lab b. Kitarlity
Rebecca Fraser 31 b. Kitarlity
Hugh Fraser 10
James Fraser 7
Annie Fraser 5
Alexander Fraser 2
John Fraser 4 Months
Address: Private House, Kilmorack, Inverness
If you check one of the birth certs from children born in the 1860s, these should include date and place of parents' marriage. This info was re introduced on birth certs from early 1860s. This would let you reconfirm details on marriage, although it looks like Ev has found a reference to it already (either banns or the actual marriage).
Mary 1863
https://familysearch.org/ark:/61903/1:1:XYR7-N4CIsabella Eliza 1865
https://familysearch.org/ark:/61903/1:1:XYR7-FYVRebecca Chisholm 1868
https://familysearch.org/ark:/61903/1:1:XYPJ-BGQ Monica