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I don't know for sure, but I think it is related to the higher fermentation temps used when distilling. I read some stuff the other day about producing higher alcohols when fermenting at high temps and this is what is discarded when chucking away the first part if distillate, also why they use ...

By using different types of sugar say raw,castor etc give a different taste or amount of carbonation?

Yes, you can prime with any fermentable but you will get different levels of carbonation if you use the same mass. I usually just use dextrose, but have used DME once. I don't think it makes a ...