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Hm, actually you already have found out everything you need and @yanyangcv stated it again in his comment: The actual implementation of the RRT planner (and the other OMPL planners) resides within the OMPL. The arm_navigation stack only contains wrappers (see ompl_ros_interface) for them.
So, you either have to find a way to apply your changes in the planner configuration or pre/post-processing parts inside the ompl_ros_interface or you download the OMPL code, link to it and apply your desired changes there.
I did both in the past and it's not too hard to get your head into it. Especially, the OMPL code is well written and documented. The included demos are interesting as well and I used them for testing my changes to the planners.
Good luck!
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