Have you tried to bi-wire the speakers with a different bi-wire speaker cable instead of running single with jumpers?
I have N803 and they are pretty bad when used with single run sp cable. I tried with different single run and bi-wire sp cable and with speakers on single run sp cable, I get tired really quick. I since have them bi-wired and no problems. I think B&Ws like to be bi-wired, regardless of the model. The jumpers they include with their speakers are nothing to write home about either. Also I have my speakers toed in so that tweete axis meets about 1 foot in front of me. I also listen near field, so that may be an option as well. FWIW. good luck
I have N803 and they are pretty bad when used with single run sp cable. I tried with different single run and bi-wire sp cable and with speakers on single run sp cable, I get tired really quick. I since have them bi-wired and no problems. I think B&Ws like to be bi-wired, regardless of the model. The jumpers they include with their speakers are nothing to write home about either. Also I have my speakers toed in so that tweete axis meets about 1 foot in front of me. I also listen near field, so that may be an option as well. FWIW. good luck