IGN1A Coil Harness Design

Hello all,

Struggling with the design aspect of a harness for 4x IGN1A coils for a Mitsubishi Evo 5.

I have attached a design below, but find different issues ill run in too, namely, using 20AWG wire for each of the 6 wires the IGN1A coils require.

I planned to splice the 4x B wires together and to go into a connector, would it be bets to get a Autosport connector with more pins and splice them after the connector? or splice them before and take up less contacts?

Any other advice would be helpful.