The stock door/dash combo leaves much to be desired in regards to the 'tweeter'. You probably gained some decent sound range and quality with that coax's tweeter.
The only issue I had with the dash paired with my door coaxial is that there was 'too much' higher end which caused me some ear tinnitus. So, you can either bandpass the dash speaker, attenuate the dash speaker, or replace it with something less efficient. I am no fan of the box 2-way 3.5" dash speakers. I went with Faital's but might try the Dayton's for comparison. I am not even sure if I need the dash speakers but am using that location.
Did you replace the front doors only, or the front and back?