hi winnieval
high reinforcement ratio is not related with the experience. You just prepare your column interaction diagram and check whether it is consistent with the required reinforcement ratio.
As to experince point, I checked many times and ETABS calculates perfectly.
As I understand, you want to evaluate each towers results seperately but they are combined at the basement levels, am I right?
After your dynamic analysis completed it is expected to get strange results because of your structural shape, in deed your mass source.
You must keep your stiffness...