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I got Nalis' ending on my first playthrough and then used the guide to get Thaumo's endings and I don't even know how I got Nalis the first time because all of my choices leaned towards Thaumo. I think the only choice I made between the two that got me Nalis' ending was questioning Thaumo about the spilled drink. To get Thaumo's ending instead, I only changed that to thanking him, otherwise I got the Nalis ending.

I'm probably late to answer but try to lean more for Nalis' choice and don't interact with Thaumo I can show you the choices I picked if you want but I think the guide in the development log has it :)