Way weaker results or way weaker sensations?
I ask because they’re not the same thing. You can tell from popping anything that will cause fatigue (brain or body). 1% in my pocket, at least, will bring on the fatigue just as well as blasting it.
It’s like alcohol with a mixer vs straight. The straight lets your body be aware as you get progressively more drunk, the mixer sneaks up on you. You’re just as drunk either way.
Dream himself has stated conscious belief isn’t needed for his fields to work, they just do.
But, like Soul said, experiment and see where your limiting belief’s boundaries are and act accordingly. Then challenge them from time to time.