Length of speaker cable effect bass response?

Maybe the design of the cable is different since its 2 companies that you are mentioning.

I bought some BlueJeans Cable a few years ago, but it was going to be used for rear surrounds where I knew it would be over 30 ft, and bought it because it was affordable...and wasnt expecting great sound .

How long have you had the Blue Jean Cables in the system ?

A lot depends on the output resistance of the power amplifier and the guage of the speaker wire. In other words, it can have an effect for the worse. A tube amp with 30 feet of 18 guage wire is a worse case scenario; a Krell amp with 6 guage wire will have much less of an effect.

I have 22ft runs without any loss of bass. I use 12ga ccc Vampire Wire.

I have an NAD int amp, Usher speakers and 30' run of bluejeanscable in biwire config. I have had the cables in my system for 4 months or so.

Did the speakers get moved during the redecorating?

If so, the new location for the speakers is probably far more responsible for any change in bass response than the wire length. This assumes the wire is an appropriate gauge for the speakers and amp involved.