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The main reason for condensation in the beginning was (IMO) the fact that metal parts cooled down over night, and then in the morning, sun heated the tank from outside and the convection of warm air started, sucking the moisture from soil, which was then deposited on colder parts (pier)
Now that the tank is elevated (insulated) from soil, the situation is much better, but there is still enough moisture in the air (trapped inside the tank after observation session) that can condense on colder metal parts.
Towel wrapped around may be a good idea, it may absorb the condensed moisture.. I will try it.
The insulation on inner side of the tank may also help.. but it's not easy to place it, as the tank is rather long (deep)
As for the counterweight, I don't have enough room to keep it on anyway.. but I don't think it's presence can cause permanent bending of the shaft - all those forces (~10Nm) are well below the necessary treshold to cause non-elastic deformation in steel shaft.
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