Random question more than anything. Anyone use lava rock between the grates & RF plate (on top of the RF plate)? Experiences with lava rock and a reverse flow? Its for my reverse flow with propane burners (which makes it a little bit different). All of my bbq's I've ever had I always put lava rock in underneath the grill grates (will be doing so on my latest build), above the heat source to act as heat retention & grease collection. Also helps with the seasoning of the grill with the lava rock sucking up the grease & the burners/heat releasing that flavor back into whatever your cooking.