Rod
A Rolling loose and a Slashing loose are totally different techniques, A rolling loose is where the archer will dip the bow during the draw, this will then allow him to get his whole body into the bow, taking the weight on his back, then the upward movement comes, all the time the bow is being drawn, then the punch forward, this is when the last part of the draw is done, then the loose, The arrow will leave the bow and the energy that is left in the bow will take the archer forward and the often off his feet, this is just the way it is, it's not done for effect and it works. There is no punching the bow arm forward the punch comes from the right leg (Right Handed Archer), The bow arm is perfectly stable when you are in control of the draw weight, so the arm will not move right or left and the shot can be kept in control and accurate.
The slashing loose is a loose that people who generally shoot the lighter weight bows use for distance shooting,however their are a few people who have enough arm strength to adopt this loose for much heavier bows, this is quite a fast draw and requires very good knowledge of your draw length and arrow length, As the archer just points the bow at 45 degrees and quickly draws the bow to its full draw and at the point of release throws his/her drawing hand in a backwards motion and gets the snappy release required.
So they are totally different.
The majority of what you say has some relevence however it is only relevant with regards light weight bows, Arrow Spine, Dry fire weight have little to do with shooting a heavy weight bow, most 1/2" arrows will spine at over 160lb.
Nick is bang on when he says that this type of loose aids distance, as does a slashing loose, both will work, some people use one technique and others use the other, whatever gets the better distance for them, those that do use a rolling loose, do so as it gives them greater distances and the same goes for people who use a slashing loose, each archer who competes in distance shooting will adopt what is better for them, it's stupid to think that they have not tried both and chosen what is best for them.
Archers that use the Rolling Loose: Mark Stretton (Held the Std Arrow Record 2003-2005), Joseph Gibbs (World Record Holder Std Arrow 2009), Simon Stanley (Held the Std Arrow Record 2006-2008, Flight Record holder 2003-2008), Steve Stratton (UK Flight Champion 2006).
Archers that use the slashing loose: Jeremy Spencer (Fight Record Holder 2008-), Alistair Aston (UK Flight Champion 2007-2008).
As you can see both techniques work well and it's just a case of whatever suits the particular archer.
It is probably wise to just applaud these people for there achievments and congratulate them for put their heads on the block by going on tv, instead of trying to analyze or make light of their shooting styles when you have not been able to achieve anything similar.
Yewbow