For me it depends on what the intent of the song.
If there's a vocal, then the only thing that matters is if the vocal tempo is comfortable to sing. If it's a dance song, the only thing that matters is whether it makes you move or not. For an ambient track it's the balance between moving slow enough to relax you but not so slow as to bore you!
The "Mixing with your Mind" method is to hold a heavy object and toss it up and catch it to the beat. The lighter the object feels to you, the more right the tempo (hopefully I've written that correctly, it's been a long time since I've read that book and writing it out made it sound over simplified and made we wonder how it could possibly work for ALL tempos).
But just like any creative decision, you really only learn how to make creative decision
by making them (and comparing the results with what you expected, adjusting accordingly on the next attempt). That's how I learned how to judge just about everything in the music production process. When making this type of creative decision I'm always trying to imagine how I'll feel about it in the future to some degree, which for me represents a more likely representation of reality (for whatever reasons).
In my earliest pro session experiences I watched as others made confident judgment calls about things like which take to use or song tempo as confidently as they made their lunch orders. My first real question after sitting in on my first "professional" session as an assistant was "how do they
know which take was best (they all sounded great to me), and how are they all so confident about all this?". The answer was "because they've been doing this for a long time!". But this IS something you can learn and can be improved!
In your case, it sounds like you're already deciphering your tendencies - now you need to calibrate reality to your experience! In other words, if you know you'll create tempos that are 5 BPM too fast if you work at a certain time of day, you simply start re-calibrating your internal clock so it's 5 BPM slower at those times!
Mental Re-calibration:
For me, it was the experience of learning how to play drums to a click that first introduced me to the concept of mental re-calibration. In my first experiences in the studio I was ALWAYS ahead of the click. I finally got so frustrated one day that I decided to play the next take TOTALLY behind the click - it was physically difficult and a bit painful to do so, and I fully expected everyone in the room to laugh at how behind I was. But oddly enough, when I heard the playback what I heard was a drummer playing pretty much
right with the click! How could that be, I wondered - it felt SO WRONG when I was doing it, but it felt TOTALLY RIGHT when I listened back. I then realized my internal clock was in dire need of a total re-calibration - "my" reality was not in sync the "the" reality! It took a while, but I eventually got rock solid with a click - but only because I recognized the problem and set about the mental re-calibration process, which was basically play behind the beat until
it felt RIGHT and ahead of the beat felt WRONG (as it should be)!
Finally, be happy you're not recording to tape with a band, going back and forth over what the tempo should be (at great expense in studio hours). Modern technology has made some things MUCH easier than they used to be!
Then again, I don't really do or know much about DnB, beside sometimes listening to it, but I do have my 175 BPM+ moments as well.
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