>>>> I had been told that after flowering, I should cut each twiggy shoot back by two nodes to create a denser branching at the ends of those shoots so that I would have more flowers the following year. Is this correct information ?
If you want to do this, that's fine, but you wouldn't do it to only the twiggy branchlets, but especially the vigorous ones, in an attempt to produce a uniform branch size throughout. Personally, I don't go for this thick bushy, humanly contrived styling. I like the natural form and character that each species has. (Not that there is anything wrong with heavy continuous pruning.) The pruning you mention to create more flowering will not create more flowering, but will create a more densely flowering plant. As the relatively unpruned plant becomes larger than the heavily pruned plant, it will produce more flowers, but still with a looser arrangement.
