Another vote for the “I” shaped DW muffle pillow. I use the velcro and never had a problem with them shifting around.I use the DW hour glass pillow. Comes in 14 and 16 inch lengths with a strip of Velcro to attach it to the bottom of the drum if you want to do that.
In my experience, a feather is THE way to go. Especially if you're wanting adjustability. A feather is highly shape-able. Most foam or fiber-fill pillows ARE a shape - but really don't cooperate when trying to be re-shaped.Feather? I wonder what the sonic effect is with that.
Sorry Masterblaster - I didn't address your question...Feather? I wonder what the sonic effect is with that.