Strings are very personal, it's always a compromise between the feel of the string
thickness and tension under your fingers.
However, Rotosound make a short
scale set in the Swing Bass 66 range. Check them out here if you like.
are 40, 50, 75, 90, and should be an excellent starting point.
PS. With a
shorter scale string tensions are always a little lower when tuned to concert pitch, so
nothing to worry about there.
When the going gets weird, the Weird turn Pro.