As to whether you would get less distortion by moving back ... I don't know, I'm not a technical wizard, but I doubt it.
As far as seeing the shot before you leave the subject ... The shot is always there through the viewfinder. I know the instant gratification must be addictive but people have been taking good photographs for a very long time without this ability.
At any rate, your problem lies with your lens whether digital or film. Try and stay between 50 and 80mm and you will have much better results. I occasionally use a Mamiya 645 medium format film camera which has a fixed focal length portrait lens, it is 80mm.
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Mike McCarty
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