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@bombcup
Nonononono, what you need to figure out is how much coffee you're putting in the basket each time. The dose is equally important as the grind, so if it's not consistent then neither will be your coffee.
You need to have a quick session with the scales and dose a few shots. Weigh one, then dose again and see if it's much different. Repeat a bunch of times until you're hitting a consistent dose +/- 0.5g. Put the scales away and rest assured that you have now standardised your dose and can eliminate that as a possible cause of the next headache.
Methods of filling the basket can keep your dosing tight without weighing. I overfill the basket, tap the pf gently twice to settle the grounds, then strike across the top of the basket with a straight edge. This gives me 22g in a double basket. I know this because I check it every now and again so don't have to worry about dose as a variable.
That method might be a bit wasteful for home use, but you see what I'm saying - get a routine way of doing it. Get used to how long to run the grinder or something like that.