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2060 will be very stable, and you can use the 2040 to go under the 2060 so you won't have the gap to fill in with a part. A dual inverted Z is the best way to go if you keep using threaded rods, if you use oldham couplers, and use better couplers than the stock spirals, If you are going to keep a single Z rod, you may have some stability issues due to off balance weight on that setup.