Perhaps King's flames are connected to his mental state of mind? When he knew he was protected by the stongest man in the world, he was confident, cocky even, and never lost a battle in more than 30 years. His fire was a reflection of this: strong, dense almost like magma.
Now even before Ryokugyu came, King was in a totally different mental state. He lost, for the first time in decades, lost his wing, and most importantly, lost his captain. Kaido was everything to King. He never cared about any other Beast Pirates member. He was not only loyal to Kaido, he trusted and believed in him. He even gave up his own dreams to fulfill Kaido's. And now Kaido is dead, and all he's left with is this annoying Queen, who also lost. King is in mourning, he's grieving. He's lost everything. What kind of fire would you expect to burn in his veins in such a state? If he managed to light any before what Oda showed us, it was hardly more than a spark.
Now even before Ryokugyu came, King was in a totally different mental state. He lost, for the first time in decades, lost his wing, and most importantly, lost his captain. Kaido was everything to King. He never cared about any other Beast Pirates member. He was not only loyal to Kaido, he trusted and believed in him. He even gave up his own dreams to fulfill Kaido's. And now Kaido is dead, and all he's left with is this annoying Queen, who also lost. King is in mourning, he's grieving. He's lost everything. What kind of fire would you expect to burn in his veins in such a state? If he managed to light any before what Oda showed us, it was hardly more than a spark.



