I've got a connection with the Qualtroughs through marriage. (Alice Bancks c1645 accordording to your site)

It mentions the Qualtroughs of Kentraugh in the context of " It was clearly in the interest of the Stanleys to employ the more influential men of island society in positions of authority"

in 1651 William Teare of Lonan was presented for "having concealed one hundred threeds of yarne from Donald Qualtrough which hee gave to the said webster to weave"

in 1700 "William Qualtrough, the miller at Kentraugh, Rushen was faced with a fine of 2s" for not grinding the tenants corn adequately.

William Qualtrough of Rushen 1666 - 82 Lords Attorney

William Qualtrough of Kentraugh 1652 - 63 Deemster

Hope that helps - if you have any other detail on the Bancks/Qualtrough marriage, I would be incredibly grateful to receive it!

Beccy