Engines smoke bahaviour?

[Ala12Rv-watermanpc]

Hi, a little thing I noticed in the new, and fantastic hornet!, is that engines smoke seems to behave in an odd way...there is not any smoke from idle to almost 97% rpm, then, from 97 to 100% there is smoke and then in after burners no smoke again...I wonder if this is the way it should be ( smoke only showing at very narrow power band) though I highly doubt it so I post it here as I havent seen any other plane behaving like this.