Miracast and screen rotation lock Dell Venue 8 Pro

...so...after installing all updates , I am still frustrated with the venue 8 pro using miracast. I can cast to display no problem, however once I have it on second display only, I can launch and use the desktop  in landscape mode, however, when I launch (or in this case install Skype desktop) the screen will auto rotate to portrait mode (I have set rotation to "lock"). This is VERY annoying, as I have to disconnect from 2nd screen, just to be able to navigate the screen as everything is now "tipped" to portrait mode again! (I have tried to make profiles to lock into landscape mode, to no effect, the tablet just keeps turning to portrait mode!....What, if any settings, will keep the display in one "locked" mode? Sometimes I can rotate the tablet into portrait mode, to get my 2nd screen to again show landscape.

I get no love from Dell support, as they seem mystified by their own device. Is miracast a "standard"? I have NO problems with android devices, as I can "lock" the display in either portrait or landscape. I notice Dell Venue 8 Pro is not a certified miracast device ( I think I seen this at the miracast alliance website?) Is this a problem with this device (like the active stylus fiasco?) All I wanted was to be able have my tablet in landscape mode, with a keyboard and mouse (no problem there) and "cast" IN LANDSCAPE mode and lock it there!

Is there ANYWHERE for a clear and concise step-by-step guide to having the tablet/miracast scenario above work? I have been hit n miss here!

Thanks in advance!

 Update: Finally have a stable connection...BUT.DO NOT let the tablet go to "sleep", or whatever it decided to do, connection is lost, and only a reboot will find/reset the wireless adapter.  Seems like this wasn't thought out well/tested/implemented?.....Actually got extend to work.....as long as this puppy dosent try to revert to auto rotate...