That’s because SOLGW uses a Sprinco extractor spring. Not a generic spring with a weak spring rate.
A weak extractor spring doesn’t hold the case completely against the bolt face. When the case is not held completely against the bolt face, the ejector is not completely compressed and does not forcefully eject the case. When the case hits the case deflector, it bounces forward. This can lead the the case bouncing back into the ejection port and interfere with the feeding of the next round. This will manifest as the new round being only partially stripped from the magazine and the bolt overriding the base.
That ejection chart is pushed as an indicator of gas drive. This is a misinterpretation. The reason the angle of ejection sometimes changes with carrier speed is because the faster the carrier, the more stress placed on the extractor. The more stress placed on a weak or failing extractor, the less hold the extractor has on the case. The less the extractor holds the case against the ejector, the more forward the ejection.
Pro Tip- If you notice your ejection pattern moving towards 1 o’clock, replace your extractor spring with a Colt Sprinco M4 spring and save yourself trouble and confusion.