Pan-adapter screen shows small peaks on either side of freq when using FT8

When using the Maestro on FT8, when in the TX mode, I see several smaller peaks along each side of the carrier.  The level meter on the DAX screen shows about 95% on TX peaks.  So, as a test, I turned it down and the smaller side peaks went away so show a perfect TX peak with nice sloping sides. So, supposedly, this gives me a nice FT8 carrier without overshoot and spurs, however, I had to turn the power knob all the way up to 100 watts, to convince the Maestro to provide just 40 watts. So, to get a clean carrier, I have to reduce power. My question is, is the TX pan-adapter accurately showing spurs when the DAX level approaches 100% or is that a bug? Do I really have those spurs?  (My SWR is very low... antenna is a log periodic.)