I've had trouble with every Optima I've owned over the last 15 years (4). I'll never buy them or recommend them to anyone for any purpose.
As far as cables go, If I am upgrading or installing any cables going forward in any vehicle I truely care about I will be using welding cable. Preferably 1-0. It conducts better, it's much more flexible and far more resiliant to damage and heat. Whenever I terminate new cables I solder them with a torch and it's amazing how well the jacket on the cable holds up to direct flame without melting.
It's a bit more money, but well spent IMO.