Dexed, I would recommend flushing that Enhanced blend down the toilet in your situation, especially since it was a free sample. Enhanced means that it is plain leaf enhanced with Kratom extract. UEI, a popular enhanced blend, is extremely powerful. Some people prefer 2g UEI over 50mg hydrocodone in terms of subjective euphoria.
Your Kratom usage is quite manageable since it is self-limiting, since 7-OH-M and Mitragynine are bundled in plenty of plain leaf alkaloids, so you can't dose too much without getting nauseous. Kratom extracts and blends are as good or better than RX opiates, and give Kratom a bad name. They are very expensive and very addictive, which makes it no surprise that your vendor gave you a free sample. Plain leaf kratom is an amazing medicinal plant, please use that and leave the extracts for the hardcore opiate addicts.
Also, from a recreational standpoint, extracts and blends do not give the "complete" high obtained from Kratom. It has more of the 2-Dimensional, hedonistic euphoria reminiscent of poppy-derived opiates. The Kratom high is much more than just the opioid components of 7-OH-M and Mitragynine. It is beautifully balanced, just like cannabis is. You start extracting certain components, like they've tried to do with Marinol, and you miss out on the beautiful synergy of all the different cannabinoids, or alkaloids, in the case of Kratom.
Sometimes I wonder how nature could have been so perfect with Kratom and Cannabis, they are both truly miracle plants.