Welcome to Rootschat and this addictive hobby.
When you say you've got back to the 1700s in a few days, how have you done that? To be really sure that you are correct and following the right branch you need to check each piece of information yourself before you add it, as one wrong bit will throw your whole tree out. Don't just accept the hints on Ancestry or rely on other people's trees - check for yourself - find births, baptisms, census records, marriages, deaths. This may mean buying certificates. Use the free sites as well as they are a wealth of information.
Please don't rush things at this stage, although you are obviously keen to find as much as possible. By taking your time and working steadily backwards, generation by generation you will be certain that your tree is correct. You have already mentioned discrepancies - check those out before you go any further. Just because it is on several tree on Ancestry doesn't mean it must be right, it just means someone has added it and everyone else has copied it.