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By reading your feedbacks, my first thought is that your coil is not 'strong' enough.
The fact that it is only 25ohms probably means that your CU wire is larger than 0.28mm (diameter), thus you made fewer turns to fill the spool.
What matters in a coil, is really the number of turns and the current that flow thru it.
So fewer turns means less magnetic field.
Also, the fact that it is only 25ohms, means that when turned on, at 12V, it will consum twice as much current so maybe your power supply is not strong enough.
Maybe you could try to increase the value of the big decoupling capacitor on the power line to be able to sustain the current when the coil is turned on.
Also, the magnet on top of the bolt is here only to reject the levitating magnet when it comes to close to the lower end of the bolt.
This is to prevent the levitating magnet to get stuck on the sensor cap.
The fact that you had to place 2 10x10 magnets on top of the bolt makes me think that you probably put them in the wrong orientation and that they 'compensate' the weakness of the coil.
On the opposite, maybe your CU wire is 0.28mm diameter, and in that case it means that it is of a really good quality, and thus your coil is twice as strong as mine.
And the 2 10x10 magnets if placed in the correct orentation serve to compensate the extra-strengh of your coil.
In that case, you could try to divide by two the values of your PID settings.
Or you could try to levitate an heavier object.
In any case, if you keep a 25ohms coil, check the strengh of your power supply.
Can you share pictures of your build ? (you can send them by mail: firstname.lastname@example.org)
Also, the new firmware should not change anything in the control loop.
It only provides the ability to reverse the reading of the sensor to be able to correctly setup the orientation of the Levitator.
Overall orientations depends on how the coil is winded (clockwise/counter-clockwise), how it is connectected to the power supply and how the sensor is placed in the sensor holder).
Hope this helps and that you'll end up with a stable levitation.