"I think you are saying you more or less confirmed your 6th Greatgrandfather through DNA"
More or less, agreed. I would like further matches on this line to confirm the connection. Would also be helpful if some of my 8 confirmed closer Laversuch matches at ancestry were willing to upload their results elsewhere, to enable use of chromosome browser and compare with the myheritageDNA match. None of them have, so I have just the one match, at myheritageDNA, to use chromosome browser with.
"When you are advised of a DNA link what actual information do you receive . -ie you share a 6th Greatgrandfather or 5th Great Grandmother? Or is much less informative? ie just share an ancestor-go and work it out. ?"
Nothing as simple as either of those, I'm afraid!
At ancestry you are provided with a list of matches, and how much DNA you share. With 4th to 6th cousins you can see who else shares a match with you and that other person, which may or may not give you clues. With more distant 5th to 8th cousins, sharing as little as 6 cM of DNA, it is up to you to work out the connectIon. If they have a public tree you may be able to work it out, you may not.
You can search for surnames and places of interest in other people's trees, which sometimes doesn't work. I found the descendant of Mary Leversuch by searching for surnames. Obviously this is only as good as the person's tree, could be wrong.
It really is up to you to do the legwork - it might pay off for you, there is also the chance that it won't. If you go for it, do it when there is an offer on at whichever company you decide to go for.
You seem to be disregarding the autosomal DNA test - as far as I understand it, it is the only one likely to give you the result you are looking for. Paternal DNA test cannot pinpoint the surname to any particular location at a given time, maternal DNA obviously inappropriate. It is only by matching with other autosomal DNA testers, (ie cousins, in whom you have no interest) that you will be able to pinpoint a particular person. Like David and I have done, sorted through the chaff and the wheat.
Regards Margaret