After doing a lot of computer research I came to conclusion that elliptical chainrings either help you climb or help you spin - that depends on orientation.
Old Shimano Biopace was designed to help you climb mashing your feet, on a recumbent that is not a good thing. Your knees will remind you later. New Rotor Q rings are better, they are designed to help you with spinning. But the effect could be also mental, so I will save my money.
Crank length of 170 comes from diamond frame bikes. Longer cranks can help you power up when you are mashing up the hill. That is not happening on a recumbent, so the benefit is lost.
Shorter cranks of 155 will flex your knee less, thus will reduce the wear and tear on the joint. For most of the people shorter crank on the recumbent should result in increased comfort and thus would prolong performance. Sound like a win win to me.
So, I am sticking with circular chainring and adding shorter cranks.
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