ah, that makes pretty good sense to me

Will run a 'true' test tomorrow & post results in the evening
Thank you for your reply btw, late here & up early in the morning so am off to zzZZ land

until i post results.. Thank you
UPDATE/edit..
I am currently running a short anim sequence over night (250 frames @ 100 samples, like i say..need sleep!) and have noticed off the bat that the generated frames are indeed showing the unwanted 'tilt' that does not show up in camera view but does in 'live mode' & final render!
will upload the rendered anim to youtube & post here tomorrow, along with more in depth test results after following your advice in more detail

and getting some sleep of course
