Sestaceans it is quite obvious that you somehow think paying for a Pro+ is somehow qualifying you to "better service" or a "better experience". You paid for an integrated tablet, nothing more. And, btw, I DID read your entire post and it was sickeningly thick with pompous ignorance that somehow the Pro+ was "special" and due more "care and diligence" than the P4Pro. That is a joke. The Pro+ owners are due no more "special treatment" than the rest of us that bought the P4Pro. If a solution to problems are found on one they are automatically fixed on the other since they are all the SAME PRODUCT!|
The idea of balance is a non-issue. That is why you use optical servos, so they go to where they are told and stay there. Balance would have to be quite excessive and I am talking to a factor of 2x the "operating torque" to allow the servo to "be out of balance", but even in that case you would see a constant struggle of the servo to correct, not a "lazy" off-level situation that we are all seeing.
Also, if you are using these for monetary reasons (ie, it is for business usage, which it is obvious based upon your post), then you should by all means "man up" and buy the professional device, that being the Inspire 2. You are using a consumer level device and in turn "b*tching and moaning" because it doesn't allow you the video/pictures you want on the cheap. If you are making money, then invest in the pro equipment. To berate a consumer level product because you can't get away with the footage you want "on the cheap" is just ignorant. You are solely complaining because you flat out don't want to spend the money you should to play "with the big boys". It is called a business "investment". Buy the equipment you need, take the footage in perfect quality and bill for it. As you said, "you do you", just don't be greedy about it.
Now, Mobilcams, per what you posted, unless there is other sensors in the gimbal itself, then it *IS* as I suspected that there is no reading of the actual gimbal and it uses the gimbal calibration to set the "baseline" and works from there, so any physical change in how the gimbal sits before flight will end up being exactly what you see in the final footage.
So, the real question here is, should you ALWAYS do a gimbal calibration before each and every flight??? <- DJI, please clarify.
If so, before you do the calibration, is there anything *we* as consumers should be doing, such as pulling the gimbal center before doing the calibration?
I would think a simple matter of centering the gimbal twist as well as pulling down on the gimbal once centered to verify it is in "rest state" and then doing a calibration would be enough to "fix" a tilted horizon issue, if that is the case.
Now, that all assumes that you have done a *PERFECTLY LEVEL* IMU calibration. When I say level, I mean getting out a actual level and verifying the surface you are doing a IMU calibration on is level front to back, left to right and across both diagonals. It also means it is a totally solid and non-moving surface. I do not know the level of sensitivity but even someone walking into a room (or the person doing the calibration themselves moving around) WHILE it is calibrating might just be enough to throw it off. Plus I would imagine you want to be outside in an open space as well since almost all homes have some level of magnetic "signature" to them that might throw off the calibration as well. The positive here is that outside of firmware updates I don't think you would really EVER need to do more than one "perfect" IMU calibration. You may need to do another if you travel and do a shoot in another area of the country or even the world, but that goes without saying that for "perfect footage" I would imagine I would want to do that "on location" just to be sure anyways. Then again, if the IMU calibration "holds true" it probably only needs to be done once, as long as the physical state of the bird does change (such as a crash) that would throw off the way everything "sits".