Feedback - Breakfast of Champions (Ken Blanchard quote)

What is the best style of feedback to get better results? Coming from a sporting background I know the commonly accepted 'constructive' feedback model. This is the feedback which tells you what you are doing wrong - the constructive part referring to the fact that when you improve this aspect of your technique/game, then you will improve. Unfortunately, as far as mindset goes, this feedback CAN put the focus on the error or problem. Post feedback, you can suddenly be thinking don't do this, or worse still take it all personally and think "I suck!" or "I can't do anything right!"
In "The New Psycho-Cybernetics" Maxwell Maltz comments how excessive negative feedback can in fact inhibit performance. This is especially true when an individual is sensitive to the feedback.
Having come from a background of 'constructive feedback' I was initially sceptical when I started using the Feedback Sandwich model. This entails telling someone first what they did well, then what they need to do to make it better, and finishing off with something good. When I first started hearing the feedback I thought, I'm tough, give it to me straight. Then I started to appreciate hearing all the things I did well, and realised how more 'constructive' this was. Even the part that needed improvement was offered wholly as a solution (rather than what I did wrong) and it felt encouraging and uplifting.
I now see the old method in a different light, and it really appears to be more destructive than constructive. Many athletes I know tend to be good enough at doing this to themselves already, that they don't necessarily need a coach to knock them down any further.
For example, after a golf drive off the tee would you prefer to hear A. You didn't contact the golf ball with the head at the correct angle OR B. You hit it cleanly, and a good back stroke, and when you angle your head like this, you will achieve a better line.
The main point I want to get across is to think how you are giving feedback, either to yourself or others. Are you considering what you did well AND working out how do do it better? Are you building yourself and your team up to greater success?