Thanks, the mids were fine on the PF350, if anything I could keep mids flat and boost the bass, it's my B100R that used to become middy at high volume.
I suspect the Portaflex cab lids buzzing a bit but will check everything as you suggest, thanks.
Then again I think the original old Portaflexes could buzz and rattle too, on balance if it's the tone your after the new ones sound great.