Cliff, Sorry for the delay, but I'm afraid I can't be much more help. I found information on the FLANDERS family, and have linked your Miriam Flanders to niece Miriam (b. 1799 in VT) who is an ancestor of William Starr Bartlett, brother to my own ancestor Orrin S Bartlett.
Benjamine Bartlett is a mystery.I've not been able to find anything on him (more than what you provided).I was surprised at the "e" on the end of his name, and tried searching without it... but no luck.
Again, sorry, but I can find no further information on the Bartlett side. I will forward your question to other Bartlett researchers that I communicate with on the off chance they'll have something to add.