I would Just put on lower tension strings and readjust the truss rod. The length is just going to be based on the Scale length. Long Scale should work for that bass. If you're not comfortable with Truss Rod adjustments then you should have a Tech set it up. Intonation should be checked as well.
2012 RIC 4003 M-G, 2004 Fender Jaguar, 2011 Fender American Special P-Bass, Hartke LH1000, Carvin BX500, Avatar B210 & B115, Rickenbacker Club # 496, Jaguar club #103