Euphoria, relaxed feeling

First I took ~1g 15x extract kratom mixed with hot water. After 20 minutes I felt relaxed and had mild euforia. It was very mild effect and I took 1g more. I waited about 30 minutes but the effect was just a little bit stronger than before. Now I took the rest of the bottle (in all 3 grams) and the effect didn´t actually come any stronger. I really enjoyed the feeling I had but somehow it didn't come as strong as I hoped and it lasted only like 3,5 hours. I didn't have any problems with the taste. For me it was as bad as coffee and when the glass was empty I put some more water, stirred and drink the rest of the stuff. All in all I'm little bit disappointed even I liked the effect.