We are willing to help you look for things, but need specific details.
You say you hit your dead ends around mid 1800's.
So - have you got the "problem" people on 1851 census? 1861? Can you post the details (one family at a time!) here and tell us where you are stuck, and we can start hunting around?
oopsie... should have read mid 1700's.
im 'stuck' on ann easey, who was born in dunwich in 1754 according to the 1851 census (yep she lived to 101 !!) . no idea who her parents were. she had a child, mary ann, in 1790 possibly out of wedlock before marrying william bickers in 1798 in laxfield. she had another daughter , harriot, in 1800 her last.
interestingly, mary ann also had 2 children before marrying, harriot (interestingly) 1811 and my great great grandfather robert in 1815 (both christened together in 1816, laxfield). she went on to marry joseph lockwood.
so as you can see, this is a mess, with apparent children born out of wedlock. i have no idea who roberts father was.
one possibility, that ive been unable to confirm either way, is that ann easey could have been married before william bickers in 1798 (she would be 44). its possible 'ann' married mr easey sometime between 1774 and 1790, 'mr easey' died between 1789 and 1798, probably in the laxfield area, as thats where mary ann was born. william bickers was 24 years younger then ann... so ann could well have been married before.
both women though pay homage to 'harriot' , whom i presume could well have been anns mother.