Never had an issue even @ 13.0:1 with a stock Mopar starter on the race car. Trunk-mounted battery.
My Hemi 4-speed car got a McRobb starter swap from its original direct-drive starter: huge improvement in spin-over speed.
One of my 383 RRs has a starter - installed by its previous owner - that looks original, but does NOT have the "Mopar sound".
The last time I had a starter problem on a street car, it was corroded battery terminals, but a weak/insufficient ground is also a typical problem.