bagger or blades

Hi,,im new the site,, i have question.i have a TROYBUILT BRONCO mower with the DREADED COURAGE KOHLER MOTOR.i bought the bagger unit for the mower and i put on new heavy duty mulching blades(the big heavy duty yellow blades-very sharp).this mower wont bag grass worth a !@#$%^&*!!!!.is my prob from maybe a bad deck design or the wrong type of blades for bagging with this mower.i mow about every 3 to 5 days to keep my yard nice looking,the grass is never really tall.ive read nothing but BAD reveiws on the Kohler motor so i change the oil 2x a yr wether(with filter) it needs it or not,,hoping to maybe get atleast 5 yrs out of this mower.i just wish the bagger would take the grass from the deck without having to stop and unclog the bagger tube every 20 mins.

THANKS,,,John66.