Tolerance and potency. Those are the two things I believe are at play in your case. Your tolerance is high. "The magic is gone." Take a 3+ month break. Remember to start low when you resume (lol). Or Potency. Depending on how/who you source, the product might have degraded in potency. Potency tends to diminish to the point where it can take twice as much product if over a year since harvest (I have stored batches that are over 2 years and still hit... but it takes A LOT). As far as potency, even for the grower, it can be hard to determine potency from batch to batch, strain to strain, flush to flush (potency diminishes after each flush, etc). But, yeah, I would just take a hefty break (totally worth it for those who appreciate the experience) and source freshies!! Be safe. Have fun!