I found a James Hanlon coming to Maryland in 1775.I guess this is too late to match with your findings.Can you email me any more info?
I was actually planning to go though the internet and compile a list of all ships departing UK to Maryland in 1775 and then see if I could find passenger lists to locate our Hanlons.
Below is the info I found- the times look roughly applicable.
Name: James Hanlon Year: 1775 Age: 29 Estimated birth year: abt 1746 Place: Maryland Source Publication Code: 6267.2.10 Primary Immigrant: Hanlon, James Annotation: Date of emigration with intended destination. Port of emigration and occupation also provided. This is the same article as source no. 6266.99.50 above with a larger introduction. There are slight variations within the actual passenger lists. A third version of this article was indexed as source no. 6267 in PILI Cum 1986-1990. The names were originally extracted from Passenger Lists to America by Gerald Fothergill which was indexed as source no. 2151 in an earlier edition of PILI. Source Bibliography: O'BRIEN, MICHAEL J. Irish Immigrants from English Ports in the Eighteenth Century. In Journal of the American Irish Historical Society NY: American Irish Historical Society, 1919. Pp. 208-215. Page: 214
Gale Research. Passenger and Immigration Lists Index, 1500s-1900s [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc, 2010. Original data: Filby, P. William, ed. Passenger and Immigration Lists Index, 1500s-1900s. Farmington Hills, MI, USA: Gale Research, 2010.