Before the final iteration, I drilled air holes instead of small slits in the culprit corner of the mold. The two iterations had shown me that the very specific area of the mold, next to the finger indent, was the biggest risk for air bubbles.
This approach finally got rid of the large bubble almost entirely. The mold-release once again did its job, and the block came off of the grip without any damage to the grip.
The below picture shows the grip, screwed onto a sanding block and ready to use. By my final iteration, we were running low on dye and I didn't like the (very diluted) final color of my part, so I spray painted it a dark blue.
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