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It could be that one of the motor mounts are pointing a bit to the side which would cause it to have to compensate. As a first thing I would check that all motors are pointing straight up and if not try to twist the motor mount a bit.

How do you power the BigQuad deck? It needs 5V on one of the 5V inputs else the pull-up resistor will not be powered and there will be no signal to the ESC. The last thing I could think of is if the Crazyflie is upside-down so the tumble detection kicks in and outputs zero. Do you have any means to ...

Good question. I think it is because the TDoA is a bit more noisy and depending on the anchor positions often Z is the most noisy. Is it different then if you would only use the Loco positioning, no flow or z-range? In TDoA the position estimation will quickly become worse outside the enclosed area....

Can you try without the Flow deck attached? Also remove the ...ENABLE_PM and ...ENABLE_OSD to start with.

It could be that you need to disarm the crazyflie but this should not be enabled by default. Please have a look at this post.

Do you have a multimeter so you could measure the signal voltage to verify you get an output?

Hi!

The BiqQuad needs to be enabled in the firmware. It is not enabled by default due to the early access project status. See the usage section for the BigQuad deck.

I tried on one of the AI-deck camera modules we have here and it is possible to adjust the focus but a bit tricky doing so as I think the lens is glued. I took two pairs of pliers and held the bottom square part with one and the "flower" lens edge with one. Then I gently increased the twis...

It sounds a bit like oscillations due to the position noise of the loco positioning system.

The rate PIDs are the lowers level of control so if they are badly tuned they would effect the flight overall. In your case I get the feeling they are tuned good enough though.

Hard to tell what is causing it so I'm just going to ask some questions.
1. What type of positioning system are you using?
2. Are you getting fast oscillations or slow?
3. Are the propellers balanced?

The battery you are linking to will most likely work. Possibly the 380mAh version is even better as it is a bit lighter. It is also thicker so possibly the long pin headers are needed.