Updated my dual cable routing through the engine bay. Originally, I had secure the two cables, coming in from opposite sides of the cockpit, on the firewall only with no other securing until they reached the throttle assembly on the engine. I added to additional securing points (one per cable) on the front of the GPS mount and secured the two cables to each other using a plastic spacer between them.
Dual throttle cables attached to GPS mount and separated enroute to the throttle housing.