I agree with the above, it's worth noting that cranking the gain way up on most profiles will lead to all kinds of nasty distortions. I you want some vintage tones, use a spring verb ( very low mix like 2 or 3% to keep some punch) on any profile, pre amp ,it really gives a vintage vibe, that I dig a lot.
I most often use a real fuzz pedal in front to ease the mix and bandpass ,even on already cranked profiles.
I used a free JMP 100 from Dennis Koehne in the past , tone is fantastic for stoner , but not easy to mix.
Check the descriptions of my stoner & psych tracks here, you'll gather a few good references . PM for the best commercial references.
I also plan a specific stoner & psych pack in the future, but I'm still waiting for the editor.