Isolation devices- to use 3 or 4 footers?

Very few components are physically balanced. I place one directly under the transformer (typically the most vibration to drain) then 2 or 3 more depending on weight/size of component

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Just starting to use footers myself. Started with my TT, that has 3. 

From what I have been reading (lots of white papers, feel like I'm back in school) the number of footers doesn't matter much, or really what you use. What matters most is that what you use is in the weight spec of the device.  So if the device is 10lbs and you are using 4 footers you want to be in the middle of the weight spec. so you would use footers that support 1-3 lbs for that 10 lbs device. 

Think the main reason for using more or less footers is trying to find that middle weight spec, and/or cost. Buying 3 footers will save a lot of money if doing several pieces of equipment. But also, anything that is a little heavy, should have a solid base. 

Anyone here use the brass cones from Live Vibe Audio?

Yes, I read their stuff years ago and tried them under my speakers and components but did not discern any sonic difference between those and other spikes/cones such as edenSound or even the bog-standard Ramset spikes that come with Sound Anchors stands, which were in fact way easier to adjust. However, many here like the Live Vibe Audio stuff so the magic may be in their steel platforms that interface between their cones and your components or speakers. I have since happily moved to compliant footers, either springs or elastomers, and given up on hard cones or spikes.