[K.Wilson]

Bill,
I used 00 welding cable also, and I have never had a "hot soak" hard start problem. But you have to use the solder-on connections and use the cable everywhere. I have seen people use the 00 cable for the pos side then buy a cheap #4 cable at the parts store for the neg side or the ground for the engine.
They will have problems because the ability to carry current is only as good as the lowest rated component in the system.
Keith