Fully Kiosk / Fire Tablet Configuration Recommendations

Anybody have some good configuration tips for using Fully Kiosk with Fire Tablets? I want my keypads on all the time, but I don’t want them to get burnt in. I set them up to have a zero brightness screen saver and motion activated - but it seems after a while, the FireOS gets involved and either turns down the brightness all the time, or bumps Fully Kiosk and goes back to Fire sleep mode / lock screen.

Mylo