My friend who takes Kratom for his severe anxiety also suffers from the same amplification effect during withdrawal. From his discription, "unbearable agitation and electric bolts". I'm taking 1tsp/6hr daily but will typically stop taking it entirely when I can get the inflammation in my back down and the pain subsides. I've never really experienced more than a couple of days of what I would describe as mild agitation and unsettled feeling. I can' t even compare it with my opiate withdrawal symptoms of years past: 14 days of electric body, vomiting bile, uncontrolled bowls, violent chills and spending half the day in the tub and the other half in bed with a high fever, and etc. So you're not alone in your experience, and I always wrote it off as Kratom's actual metabolic action not being really well understood, and why I always think the comparison to Tramadol is better than other opiates.

As a counter point, I've been taking 4x 3g doses almost every day for over a year, and there hasn't been any development of tolerance.