I agree that is the general pattern. The obvious problem is that there is no way of knowing exactly where these currents change - in either direction or magnitude.
However I think we agree that the bodies likely drifted NE or N or NW for most of the time before they were found. This means the impact point is a fair way south of where the bodies were first found. I don't think we can be more specific than this.
So I wonder why the search area has been so far north - north even of the first bodies found. On the basis of drift analysis alone, this is hard to understand. Presumably those responsible have access to other information that points elsewhere. And I am sure that all the information available is somewhat contradictory and doesn't all point to the same spot. It would however be interesting to know what this other information was.