IMO the key to using this head with a wider variety of basses and cabs is to treat it as if the Bass and Treble controls were almost boost-only. If you set both bass and treble at 9:00 to start, set your first gain where it sounds good, and tweak from there, you have way more mid shaping options than if you start with everything at 12:00. Like any tone circuit based on the old Fender tone stack, you can increase mids by turning down bass and treble.
Interesting-this is exactly what I tried today,before I read your post.
Ive had my Streamliner for a week now and have logged several hours on it.I have to say it has a very addictive tone.I love my 9.2 and it will see plenty of action,but the Streamliner just has a sweet,smooth,warm,and musical tone.It sounds great with my pair of Neox12's with plenty of volume.Ill have a chance to get this rig on a couple gigs this weekend-Im pretty excited to hear this in a full band mix.I read several reports from folks that loved it at home but it didnt cut through the mix on a gig.I could be totally wrong and Ill find out soon enough,but based on how this rig sounds compared to many other rigs Ive auditioned at home Im thinking this rig will sound great in a live mix.Im sure the voice of the Neox cabs help-they are fantastic sounding cabs.Ill take my 9.2 just in case,but at this point Im planning on going all night with the Streamliner.
