DIY Jumper Suggestions

One benefit of bi-wiring is keeping the bass current separate from the more nuanced mids and highs.  If you run one of your bi-wire speaker cable pairs directly to the LF terminals and then jump the other pair between the MF and HF posts, then you probably don't need 8 awg wire.  If both pairs of your bi-wire speaker cables use the same gauge wire, then one option would be to match that gauge with your jumpers.  I would pick a type of wire that most closely matches what is in the speaker cables that you like, i.e., stranded or solid core, copper or silver, etc.

I like using a spade at one end and a banana at the other end of jumpers I have made so I do not need to stack spades.  I would not skimp on the connectors and if you purchase connectors that offer a set-screw  connection option, you can always use them again if you want to try different wire.  Furutech  FP-201 and FP-202 would get the job done.

Avoiding spade stacking is just my preference so I don't end up with bent spade connectors.  If your plan is to do it once then leave it alone, stacking them should be fine.  I move stuff around too much so don't like to be bothered with it.  Since I make all my own wire now, I connect everything to two spades at the amp end.  Just made a set of bi-wire speaker cables with 2, 9awg runs to each speaker so needed to connect 6awg of wire to a single spade at the amp end.  Furez spades from Douglas Connection worked great.  I used Furutech at the speaker end.