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Welcome to the forum. A plunge base should be used for convenience of depth adjustments as you go from all I've gathered on the subject and speed control is a must but most have that already. Here is a speed chart that gives you the suggested speeds for different sized bits. Also keep in mind that multiple shallow passes are safer then trying to deep on the cuts. I limit mine to no more then 3/16-1/4". You large sized slabs make me wonder how you can comfortably do 66" wide without moving from one side of the slab to the other considering reach unless you have a mechanical way to move the sled from front to back. Would be interested in what you come up with.