Made statements meaning that on their Criterion Core product page, they list what A5 combo works best for that barrel IIRC. It wasn't at all unfavorable, but indicated that they had conducted tested to find what worked best with at least the Core line of barrels.

In the meantime, I'd try a stock rifle spring if you have one and want to continue troubleshooting. Honestly not sure what it would indicate given all of the other data, but I've had problems with the green spring on conservatively gassed setups.