You need to test various different LEDs until you find the right visual presentation that appeals to you. Don't use 90 Degree LEDs, they will concentrate the light in the "spots" you mention. Use 170 or 180 degree LEDs - or even Superbrite. I was using Superbrites a long time before others started using them and they look much better than standard LEDs - again - my opinion - as everyone's eyes are different !
