Per my other thread, I got a older bike and the rear wheel was very wobbly. I decided to try to true the wheel and it's gone very wrong. I have a stand and a Park meter (which I'm learning to use). I thought I could bring the tension down on all the spokes and then bring them back up to an even tension using the meter as a guide. I don't know what the proper tension should be and not sure how to find that info. But checking where it was it seemed like drive side were mostly 20 (on the meter) and non drive were 15. So I took everything down and brought the back to even 20/15 and my wheel looks like it's tacoed now. Then I tried to do both sides evenly and it still looks completely tacoed. One thing I noticed is that when I go through and adjust the tension that spokes I had previously brought to 15 are now close to 0 without me having loosened them.

Am I doing something wrong? I figured I could just try to get even tension and that would be a good starting point.