Replying to Fixing a monster core shot along edge?

Got a huge core shot last spring riding some low tide snow in tahoe. About 9" x 0.25". I've done simple ptex candle repairs before so I figured I would try my first base weld to repair this.

Got some metal grip wire and real ptex and followed my man DominatorJacques video (https://www.youtube.com/watch?v=suk5BFA7ETc&ab) melting first a layer of metal grip and then layers of ptex until it was flush with the base. Unfortunately, I skied it for the first time yesterday and it mostly ripped out.

Looking on the internet, seems I might have more luck cutting a geometric shape out of my base and patching it with a sheet of ptex and marine epoxy (https://www.tognar.com/p-tex-ski-base-patch-material/ and this thread on TGR).

Thoughts? Here's a pic from today after most of the repair ripped out.