a 2s1p Evo20 800mah into a 4s8p 3200mah

[squeeforever]

Yup. You can't make a 4S8P pack (32 cells) out of 8 2S1P packs(16 cells). By the way, you would only need 5 wires for the balancing plugs. You don't balance each individual cell. You balance each individual group of cells, so either way (whether it is 4S1P or 4S8P), its gonna be balanced as a 4S pack...