With playing triads, what is your point of reference / thought process when finding the nearest triad? I assume you don't think about it in terms of actual notes (i.e. I need to find an Eb triad which has an Eb, G and Bb therefore I must find one of these notes nearby and play the corresponding triad) as this would perhaps be too many mental steps.
If you haven't started the July Challenge, you should now.
That is how to learn how to feel Triads without looking :-)
Kurt
Thank you Kurt for suggestion!
Tomo