The Decklink and the Nitris DX live on two different systems. On the Nitris DX machine, under Video Output Tool, I can choose P or PsF. On the Decklink machine, under Tools, there is a Hardware Settings tool, that lets me adjust some settings for the Decklink card.
I seem to recall that with the AJA Io Express, there were certain settings that I could change when using AJA’s Machina application.