The filter coffee that I have purchased contains 53% Coffee and 47% Chicory.  Since I don't have a machine yet, what I did is as follows:  Spoon measure: 6 ml   I put heaped Coffee spoon in a steel glass.   Added 60ml boiling water to the same, stirred and kept in untouched for 6 minutes.   Then I added 200ml hot milk to the same with 2 spoons sugar. Filtered the mixture using a strainer.   The result was NOT strong Coffee.  Questions:    Do I need a Coffee with less amount of Chicory?   Do I need to add more Coffee OR steep the same amount of Coffee for a much longer duration?  
Chicory is completely a matter of personal taste.    Trying to make a coffee concentrate and then dilute it with milk is a very unusual practice (at least without an espresso machine).  I don't know if the water will become saturated, but you might try brewing in a much larger volume of water, and then adding cream after which is a more typical practice.     6 minutes is a little long for most peoples' tastes; 4 minutes is more typical.  You may be getting a more bitter cup than necessary due to overbrewing.  6 ml to 260 ml total beverage is very weak; you may try closer to 30 ml to 200 ml as a more typical starting ratio, which you can then adjust according to your taste.  Other than that, make sure your water is at appropriate brewing temperature (without a thermometer, bring it to a boil, then turn it off for a few seconds).  Don't use metal glasses, which lose heat  quickly; use something glass or ceramic.  See also:  Coffee Geek discussion on rations (in metric) 