Quoted from JordanB:I'll give that a try, thanks! Guess "non-ghosting" LEDs don't solve this problem.
Non ghosting bulbs help prevent ghosting and not really flicker. Ghosting is where the bulb is supposed to be off but there a little current that slightly lights a led bulb. Non ghosting bulbs add a little resistance to prevent bulb from lighting on weak charges. Dimming is the fade effect in game or power saving mode in attract mode that led bulbs don't handle well and flicker.