Room Lighting app light level inconsistencies

Groups will definitely help with the popcorn effect for your bulbs attached to the Hue Bridge. If you want to use scenes from the Hue app, you'll need to use a community app to bring them in. There are two main ones available. I personally use [RELEASE] CoCoHue: Hue Bridge Integration (including scenes!) to bring my scenes into Hubitat. Scenes are actually the primary way I use Hue bulbs with Hubitat.