I used to have a ton of problems with consistently hearing same thing. Everyone talks about wall voltage, working heat, aliens, etc.
All that is fine and well. The best trick i have found was given to me from @MGL AmpWorks
I wanted a single channel, but he gave me an extra volume in lieu of a clean channel. What i do is have one master that is practicing volume. The other is playing volume. THIS is what I EQ my amp to. This cannot be overstated.
Changes in your master are going to greatly affect what you hear in your tone stack. If you are not consistent with the volume, you will be grabbing the eq to hear what you think you need to. Then you change the volume and it is off.
The amp needs to be breathing fire for you to know how it sounds