I don't know if I can shed any light on the generations prior to your John Eve born in Soam, Cambridgeshire in 1829, but I may have a related lineage.
I have a Susannah Eve who was married to Thomas Ede (similar surnames a coincidence) on 30 Nov 1856. They were married at the parish church in Paddington, Kensington and lived at Conduit Place, Paddington at the time of marriage.
Susannah's father was John Eve who was described as a Shoemaker. He was a witness at the wedding so we can assume he was still alive at the time. Now as he was Susannah's father he would be too old to be the same John Eve you describe as a bootmaker who was born in 1829. However my John Eve may well be of the same generation as your John Eve's father or who knows he could even be his father, it is interesting that they have the same trade. (ie. could it be that your John Eve born 1829 is the brother of my Susannah Eve)
I unfortunately don't have a birth date or place for my John Eve or Susannah.
I wold be interested to know if any of this fits in with your information.