Powerful lights at the right height, decent strain and decent nutrientsThe best way to grow tight buds is to grow healthy plants from start to finish with plenty of light. You also need the proper strain as some strains just don't form tight nuggets. The last thing you should be looking at is nutrients and additives. Environment and lighting are what you need to focus on. Any nutrients can provide what the plant needs so don't get suckered in with fancy labels, and cartoon names because environment and lighting are much more important.
Good luck.