MSD Disappointment ??

Kendog 170 said
I wanted more initial but increasing slowed cranking even more. Rear mount Battery 1OT Cable to a terminal at firewall near brake pedal then a 12" standard size cable to starter.Starter relay in trunk fed with 1OT as well. All connections are clean and tight.1 OT ground from frame rail to Battery. 1OT from frame rail to engine block. Smaller ground from block to heater motor as well.
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It would be a small pain in the butt, but for diagnostic purposes, you could TRY temporarily having the battery in the front, maybe on a roll cart with some cheap battery cables just to see if it turns the engine any better. That would either confirm or rule out the long cable run from the back. Just a thought.