I've been trying to focus a bit more on Analog circuits lately and found that my design and actual results often don't match up exactly. An example is a Pierce oscillator I built a while back, the circuit worked mostly as expected but the gain required was much less than I calculated for (meaning I got some distortion). Is it common practice to just change the values to what seems to work right and go on or is it better to make sure the theory matches up as well?
To clarify, I mean that after observing the difference and playing around with some values I change the design to match, the circuit then gives the desired output but my initial design was inaccurate. Should I go back and try to identify why or is it just not worth it? ie, no calibration on production units.
Thanks for all the replies, I'm going back to the drawing board because there's clearly something going on that I don't understand. Ignoring it would possibly create other problems.