Which Ayanamsa to use in Sarvatobhadra Chakra?

Hi Ernst and all,

Recent I have undertaken a study on Sarvatobhadra Chakra (SBC). I've often seen that in practice that Aries is fixed with Ashwini Nakshatra while constructing the SBC. Since the zodiac is tropical, which Ayanamsa should we use in SBC for predictive purposes? Do we use the plain old Lahiri and assume Aries=Ashwini in sidereal coordinates for constructing the chart, or do we use tropical coordinates for both signs and Nakshatras?

Thanks a lot.