I am no expert but the white, waxy residue is probably from the detergent, maybe a few more rinse cycles may have been needed.
Also, i used a beal rope brush to wash the rope. While running the brush over the rope, i noticed the sheath tended to bunch up in certain areas and i'd have to tug the brush over these spots.
As for the sheath bunching up, that sounds very suspicious to me as most Beal ropes have a zero sheath slippage factor.
I have contacted Beal and asked them for their insight to your problem. I will get back to you on this issue.
I have also asked them for a complete run down on rope maintenance as there seems too many different points of view out there.