Z-10 gunship engine never has problem. The underpowered engine rumour is spin off from a nonsense article from China Military Defence forum claiming a redesign of engine exhaust is a result of engine underpowered after US embargo of PW engine to China. Plenty of hatre and ill informed news against then slowly spin off including non substantial rumour claiming armour is sacrificed for lessen of weight.They neglected to mention that the engine has also been upgraded.
Now the retribution for that anti-China military forum is heavily reduction of viewership which now makes it insignificant and loss of revenue. I stopped visiting that forum long ago. Too many haters and fake Chinese imposting as real Chinese trying to demoralise Chinese achievement.