We experimented with and adjusted the process.
We developed the process by trial and error.
develop (V) – find something, by working hard, that did not exist before
discover (V) – find something, often by chance, that already exists
err (V) – miscalculate, stray, stumble
error (N) – mistake (make a mistake)
try (V) – test, experiment (try out)
trial (N) – a temporary period of testing whether something is suitable or not.
REFERENCE (word use corpus)
"1rst Branded Tomato in Greece - PRIMA" by Christos D. Katsanos. Wikimedia Commons. Licensed under CC BY-NC-ND 4.0 . Accessed 30 Aug 2019.
(The person in the image is not the source of the Pop-Q comment.)