How about using a small pump to pump water to a 5 gallon bucket on a shelf. Have the bucket fill up and then overflow back to the res so that the 5 gallon bucket is always full. Then just feed the blumats off of that 5 gallon bucket.
Other then that using a pump to feed the blumats is pointless - if your going to attempt that why not just use a pump to feed the plants normally. - saving you the money on blumats and having to dial individually.
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I have not noticed any impact on yield or quality with warmer then normal reservoir temps when using blumats. Reservoir temps normally are an issue to prevent pathogens and are kept low so that your water can hold as much oxygen as possible. Important in an active hydro system, but not so much with blumats/coco as your medium has a good oxygen/moisture ratio - your not relying on your water to provide this oxygen.
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Have not really noticed any distinct differences between the formulas. They all seem to work flawlessly. I'm more partial to 8/16 and maxibloom because I'm not doing any real math. I've got to pay more attention when mixing HEAD recipe as its not double the bloom as I'm used to. I'm leaning towards maxibloom because I like to top up my blumat reservoir before its completely empty (say 5 gallons left or so). Because of this its easy to top up, add nutes until I hit my target EC. With head recipe this was more difficult because I was unsure of the amount of water I was adding back to the res which already had SOME water in it - if that makes any sense.
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Biggest mistake I've made using blumats was letting my reservoir run dry. Blumats/pots ran dry and I had to resoak blumats, pots, and then manually re-adjust every pot. Sucked.
I was just about to ask somebody how reservoir top offs work. I'm a total noob about this stuff because I'm hand watering with H&G right now. Directions so to mix A first, then B, PH then the additives. If mixing my A into an almost empty res with nutrients already. Isn't that going to make my nutes out of whack? A one part like Ionic or the floranova series would be so much easier. Just fill up with and pour your nutes in until you hit your desired EC.
D2G