You are correct that the Scotty gear head track adapters do rotate. Since they tighten in a clockwise direction, the rotation on the right side of the kayak following a fish strike will tighten the base. However, if you use the gear head track adapter on the left side of the kayak, a fish strike will tend to rotate the holder in a counter-clockwise direction, which loosens the base. From your photos I cannot tell if you have the lateral space to mount a standard Scotty base onto the gear track using two track slugs (or directly to the plastic area where you now have the track). I have done that on two Native Slayer Propel kayaks. It is a much more stable attachment point -- the third photo shows my front rod holder with an extender (this generates even more rotational force due to the additional leverage).
Originally Posted by silasvirus82
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Another alternative that I explored before thinking of using a standard Scotty base was to run a bungee cord from the front left rod holder to a mounting point in front of the rod holder. If the left side rod holder got a fish strike and began to rotate counter-clockwise, the bungee would stretch and provide more resistance to turning. While this did help somewhat, it was a bit messy to have another loose cord in the cockpit area.
Native Watercraft Manta Ray 11 and Slayer Propel 10
Member - Pro Staff team for Native Watercraft
Author - "Fishing in the Comfort Zone" - light tackle fishing techniques for kayaks and small boats