I check on this site periodically just to see whether there are any new postings and today I was fortunate enough to find yours. You will see my name below some of the earlier Schenck Family enquiries.
I am now sending you some information by e-mail and an attachment with the hope that this will at least be of some help in finding the Isaac that you are seeking.
May I take the opportunity of wishing you and your Family a very Happy New Year and every success in the search for your Family History!
With warm good wishes
David (David H J Schenck in the County of Surrey, England)