One thing I found is that when Ifly the MSR in the living room which has alot of furniture all around I get the exact "wandering around" hovering that you describe. However when Ifly the MSR up in the loft which is quite open and spacious without furniture the hovering is perfect wth absolutely no "wandering".

So I have concluded from this that due to the "wash" created around the MSR from its rotors, a significant amount of reflected "wash" can occur if the room you fly it in has lotsof furniture around the flying area. And this to me is the cause of the "wandering" despite the trimming I do as the MSR is reacting to its own "wash" being reflected back at it from different directions at the same time.

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