I see. So your livewell system is designed to only pump when not on plane.
It's getting in somewhere else.. but you already knew that…lol.
The metal strip on the V you described is the keel guard. Can you tilt the boat forward and then spray water in so that it would rest against this to reveal a leak?
Other than this, you'd want to put the boat in the water, fully drained, and inspect in every location you can. If there is water accumulating, you'll know the leak is below the waterline.
If no water accumulating in the bilge, run for a while and then stop and look in the bilge. If there is water, you'll know the leak is above the at-rest waterline. Likely places for this are on the back 1/3 of the boat and possibly much higher on the boat than you'd think.
The way I found the leak on a glass boat that was between the cap and the hull was by taking a piece of paper(card stock) and sliding it between the cap and hull all around the boat. When the paper hit the spot where the separation was happening, it slid right between the cap and hull. This would only get water against it when on plane and the design of the hull made water come up the side of the boat and hit that spot perfectly allowing water to get in.