Hi Luvs2jump, afraid there are so many ifs, buts & maybes, along with a few things I flatly disagree with in that first doc by Cavallo, that I'll just say I basically disagree with their advice & that it is potentially asking for trouble to trim in such a manner. Looks a bit Strasser-ish. barefoothorse.com & barehorsecare.com are 2 more great sites with the basic principles of trimming also. Sorry to put another spanner in your works, but it's a good illustration of the importance of learning the *theory & principles* behind the practices in order to make an informed decision on what sort of approach you'll go with.
Of the second link, looks like mainly pretty good info in it. It seems to depend on who you ask as to people's definitions & symptoms of lami & founder tho, so I wouldn't consider it wrong at all, but is different to mine. Lami for eg. may have no obvious symptoms at all for eg. Horses are not always in pain with it, and it may then be termed 'Low-Grade-Laminitis'(LGL). Also the mechanical progression of the untreated 'disease' - founder - doesn't necessarily include 'rotation' of the coffin bone. It is common for a horse to founder(literally means 'sink') without rotation, as the separated coffin bone drops in relation to the capsule. This is commonly seen in racehorses & other intensively kept & fed beasts & causes the 'typical flat TB foot'.