I tried your suggestion. Without any weights on it, the mount is way underbalanced. So it was a couple degrees off. Once I put all the gear and balanced it perfectly well, it came to exactly 15 degrees angle for 1h. So I guess it is all good while indoors in a room temp.
Next, i will disassemble it and try to isolate it a bit from the colder weather with some isolating aluminium tape. I was also adviced to buy lithium grease and put some so it would compensate for the gearing contraction a bit. Wednesday might be the next clear night, so wish me luck!

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