Finally tried out some of the other modes on the Apollos in the last few days.
Had a very delightful and surprising discovery.
In Eco mode.... I was getting 2 th/s @ 76w per th/s
in Balanced mode.. I get 2.5 th/s @ 64w per th/s

So, not sure why but balanced mode actually offers better wat per wat performance for me.
Also, it was a more substantial hashrate increase than I expected too, with 25% performance gains over eco.