Ignio, your description of the high is almost identical to the high you get from hydromorphone, which is also far from my favorite. Secondly Tramadol always makes my methadone feel weaker! Maybe it was due to an increase/spike in tolerance, rather! I got sweating too and thought the powder was cut with PVP, another semi tolerant person who took about 60mg said he couldn't sleep, even after taking trazadone.
There were days I would snort 80mg hydromorphone and this would be the exact same effect I would get, I kind of feel the same effects from this one.
I finally tried snorting it and its 45min on the mark, with the most intense nose burn ever, that it makes me tear up. The rush is pretty good but your nose gets stuffed easily. Its not my thing but only due to the side effects I suspect it has. If it did this much damage to my nose having used it 24hrs, I can only imagine what its doing to my stomach when I take it orally.