I would to do my own defoliate comparison if there was a "correct" way that makes sense to me. The problem with defoliating is that it can easily be done wrong, and from many of the photo's I've looked at, many growers seem to do it wrong in my book. I fear I would do it wrong. I may take a plant that I don't care about and play around a little. I have a few clones I'll be using as mothers, I can yank on those plants a bit without harm I guess.
That's why I'm very interested in this experiment.
I don't think there is a 'correct' way of doing this technique yet Roach, it's still at it's early stages but there do seem to be basic guidelines.
The golden rule is give the plant enough time to recover before switching to 12/12, this is generally 10-14 days from the last defoliation to flicking the switch. Apart from that it's all pretty much up for debate/experiment.
A basic guide would be something like:
Day 1 - First defoliation
Day 14 - Second defoliation
Day 28 - Flip to 12/12
Day 49 - First defoliation in flower
Day 62 - Second defoliation in flower
As to how much you defoliate the plant, that's really open for debate! Have fun experimenting though, it will be interesting to see the results.