My reverse tolerance comes from using salvia divinorum extracts. Indeed, much less to smoke but much more effective.
I wouldn't say each time that I've used salvia it was substantially more intense with each session, but rather the intensity increased any time I experienced novelty during the experience, and to a significant extent when compared to other psychedelic plants.
If plain leaf is all you have then perhaps your own extraction may be worthwhile for stronger leaf material. Also, grinding the leaf down to near-powder might help reduce the amount of bowls required. That way you don't need to take 3-4 bowls in one sitting and fit more material in your pipe. However, it could be a bad coughing fit. Personally, I found combining small amounts of peppermint leaf with salvia divinorum to reduce coughing.
'What's going to happen?' 'Something wonderful.'
Skip the manual, now, where's the master switch?
We are interstellar stardust, the re-dox co-factors of existence. Serve the sacred laws of the universe before your time comes to an end. Oh yes, you shall be rewarded.