I wonder if tolerance baselines are permanent, once you’ve used for a while, so even rest periods don’t drop levels to that of kratom newbie. I think resting can lower the tolerance a bit, but never back to pre kratom levels. Same with opiates, in my experience. First time I got green Borneo from KB it was great the first couple of days, then it was like my body just went ‘oh, this again…’ I think Kratom UKs Bali Gold is the most potent I’ve tried, but unfortunately it’s expensive.