Hi Paul - long time!
I struggled with this, but found the Stockleys (Charles, Martha, James, "Albacon", Emma and Fanny) in 1861, but no Galtons. The Stockleys are the last household on the Ridge schedule. In 1851, the Galtons are there as you say (but only George, Sophia, Harriet and George) on one page, but then on the following page are the "Hockleys" - Charles, Martha, John, Charles, Levi, James and "Alben". The Galtons are the 2nd household from the start, and the "Hockleys" the 4th from the end, with 8 households in between - if any of that means anything at all! It doesn't really look as if they were next door, though.
The cottages you have picked out, on what is now Barnhill Road look fairly spread out on the map and don't really equate to the description in the report, though I see that the date on the map is 1890, so they may have fallen down by then! When you read a description like this, you begin to understand why some of the large Dorset estates spent the 60s demolishing their cottages whenever they could get the tenants out.
Interestingly enough, I examine the accounts of Arne Parish Council, which includes Ridge.
Richard