It's important to consider the character of the Maelstrom in your game. The Maelstrom doesn't just pick questions out of a hat: it wants to know things. It has a reason for wanting to know particular kinds of things, even if it's just a particular sort of curiousity. Ideally, though, it wants to do something with the answers. It is, after all, a threat with a particular agenda.
One of my favourite Maelstrom questions, from a beta/playtest game of AW, went like this:
MC: So that place you came from [that you've described before] before you were here... who was it there that you trusted most?
PC: Uh, I guess it was [so and so]... [some reasons for why that is].
MC: Okay. As you think about [so and so] you realize that actually, there was someone else, someone you trusted more... but you've forgotten about them.
I was neither the PC nor the MC in question, but when this went down my excitement and apprehension about Opening My Brain went up several notches. I immediately had a sense of the Maelstrom as a separate thing, something with its own needs and also its own power. Opening My Brain was not a one-way street, where I just sort of get some information and la dee da. Sometimes there were going to be costs, and they weren't always going to be obvious.
So, I would suggest thinking about not only questions, but what the Maelstrom is going to do with those answers. It doesn't always have to be something immediate or obvious, like in the above example, and it doesn't have to be something bad either, but The Maelstrom is asking for a reason. Think about ways to make those reasons consequential, and (eventually) evident.