I think a lot is to do with the positioning of the strap posts. The easiest bass for me to play for any length is my Yamaha RBX which seems to be perfectly balanced. My Burns Marquee reissue on the other hand weighs about a kilo (2.2 pounds) more and the forward strap post is positioned too far back on the body, such that it hangs off my left shoulder and gets me twisted up & achy after 45 mins. I want to put straplocks on it so will put it at the top of the upper "horn" opposite the 12th fret (a' la Fender) rather than replacing the existing one at the back in line with the 14th fret as it sits now.