I'm a direct descendant of Henry the immigrant, through his youngest son, Jonathan. I started researching this line (my maiden name) more than 20 years ago. There's only a small handful of Whelpley researchers that I'm aware of, that have collected data on a lot of Whelpleys more recent than Rebecca Whelpley Sanford. It seems that the majority of Henry's descendants are through Sandford line, so until I started researching, and then later, my cousin Brenda, there wasn't that much available on line. There used to be a Whelpley website, maintained by Brenda, but she took it down several months ago. (Not sure why, but it could have something to do with some blatant plagiarism. And I don't blame her for being angry about it.)
Prior to computer research, there were two books put together on Whelpleys that I don't believe were ever published...well one might have been. A Canadian descendant Gordon M. B. Whelpley, and another whose name I believe was McIntyre (I have a copy here, but not handy). There's a lot of false data out there, especially in the old Canadian research, simply because some of it was hand-me-down family rumor, and no documentation. The Canadians, descendants of Darling Whelpley, had been particularly interested because through their line, they qualified for membership in the UEL, the Canadian equivalent of the DAR. Another cause of the errors is simply an attempt to create a connection to a famous or prestigious family, a common problem in old research.
So far as I know, I've found all the published mention of Henry Whelpley, the immigrant. It's scarce, and not a complete picture, just a piece here and there which puts a partial picture together. As I said, we really don't know what he did for a living, if anything, besides a family farm, some cows, and buying and selling real estate. We don't even know when he arrived. It's a bit frustrating, since he seemed to live near (and I'm sure knew, went to church with and did business with) so many well documented men of that day. One neighbor was Simon Hoyt, a well-researched family. And then there were the Knapps, the Bulkleys, etc. You'd think there'd be more on paper about him. But, it appears that Henry lived to be only about 40-45 years, and still had 2 teenagers and 4 minor kids at the time. Didn't have a chance to make a lot of money and probably kept his nose to the grindstone most of the time. And he may not have been very healthy during the last 10 years of his life. (I'd guess that he died of TB, a common killer in those days, and 41 years was the average life time then.)
As for needing info, I don't turn it down, but don't feel hurt of I have a lot of it already. I'm always hoping that someone will find something new, so in that sense, I'd welcome some data. My own line is as well-researched as possible, so it would be in an effort to get more info for other researchers that I'm interested in more data.
Of the branches you've mentioned, the ones in NJ were descendants of the Samuel Whelpley (the history book author). The ones in OH were from more than one branch, but all prior to 1850 were descendants of Henry through his son Jonathan, as all of us with that surname are. There was also a branch that arrived in OH from England during the 1800's.