Speaker Sound

Or use speaker wire as jumpers.

Something sounds wrong.  PSB makes pretty good speakers and certainly don’t design speakers with the glaring flaws you’re describing.  I’m guessing there’s a problem somewhere and replacing jumpers won’t likely fix it.  Bi-wiring budget speakers seems silly.  If anything, demo some jumpers and go from there, but something else seems amiss. 

Do I need jumpers with Biwire speaker cable? Will the cables be enough?

The theory of bi-wiring is that separating the current of each driver improves clarity.  If you use jumpers and bi-wire you are eliminating the benefits because now the current flow will be equivalent in both sets of wires.

Or use speaker wire as jumpers.

@teeter ^obviously^ … but at this point the OP could cut up and old extension cord and use that wire if he/she was too lazy to leave the house.

“no wire” jumping over, is worse that using some “non magical” speaker wire.

I got ahead ahead of myself. I realized that there were no jumpers. I owned a another pair Stratus Mini's years ago and used them with a Bryston 3B-SST. I removed the jumpers and used JPS Labes Biwire cable. That is probably the issue. I have biwire cables coming tomorrow.