I would recommend checking the pressure into your system. The next step would be to use a nozzle that is adequate for the radius you are looking for.
Never try to use a “One size for all” nozzle and you should never try to reduce more that 10% of the nozzles distance.
If pressure turns out to be your issue, you may want to consider using Toro Precision nozzles. They are designed for low pressure uses. You can get them in the Toro or Rainbird/Hunter thread patterns.
Be sure to change all of the nozzles on the same zone.