We just spent Sunday night in Swan Creek this past labor day weekend. (BTW...what a awesome sail back Monday!)
I also draw 4', and have always cut between the two range markers with no problems. A friend was in Swan creek this weekend as well, he draws 5' and cut just North of the tall (northern) range light with no issues.
As Sailor Mitch, I am coming out of the Patapsco River, my way point is the Red 2 marker south of the Green 1.
Where I have touched bottom was entering Swan Creek on the approach because we veered a bit to far to port