people could often not spell their names resulting in number of variations that are recorded.
Isn't it more the case that there
was no right or wrong spelling until relatively recent times? People just wrote names down as they sounded, and as long as the people around at the time knew who was meant, no one thought any more of it.
It was probably not until the late 19th/early 20th century that spelling really became standardised. Even in the first decade of the 20thc, my grandfather and his siblings were variously registered as Davis and Davies, and while all the rest of them went with Davis, one of his brothers insisted on spelling his name Davies and passed that down.

As for the tangles - I agree with those who are saying don't give up! Write it all down and keep it to one side somewhere, as you never know when something will turn up to confirm or eliminate something. If and when something does, you'd be kicking yourself if you hadn't kept notes of all the candidates.