A couple weeks ago on 23 Aug we got +2" of rain and I was on site and checked for the seep(s) along the entire edge of the pond. Only one was found as noted - right where the dozer went in.
How are you locating the seeps with high banks all around your pond?
Do you think the tree trunks are acting like a "pipe through the dam", and water channeled through your constructed bank following the long-axis of the tree trunks?
Your plan sounds solid to this non-expert.
P.S. Did you go from "Stressless" to "Stressed Out" when someone tried to add a Komatsu dozer to your pond structure?
Good luck on your upcoming repair job!