Though I will note that in the past we have not always agreed, I feel the need to come to your defence on the "pillars or heterodoxy" issue.
Roman Catholic neo-conservatives (particularly the American variety, who seem very ignorant of the fact of just how isolated a group they really are; there is no ideological equivelent to them in Rome, or anywhere else in the world) like Armstrong and Carrol are no better, nor any worse, than any other heretic of an age past; as their sincerity (or lack there of; does it really matter...let no one pretend they can read the minds of these men either way) doesn't really matter. It's the damage they do which is of real importance.
Sadly, in the case of all three of these men (and this is the rub), their ignorance/distortion of facts is only out done by their smugness, along with a "punch and duck" approach to "apologetics" and argumentation. For example, Armstrong will imply or even forthrightly state the most unfair and skewed things about the Christian East (and as you mention, not simply about the Orthodox, but even Byzantine Catholics...though it's the former that really seem to get on his nerves), but when anyone (on doctrinal grounds) questions the propriety of the RCC, they quickly become "anti-Catholic."
This reminds me of the game that liberal American Jewry plays; any criticism of either the Roman Catholic/Jewish religion, or the culture surrounding it, automatically renders one "anti-Catholic" or "anti-Semitic". It's a cowards ploy, and should be called such.
I've personally tangeled with Dave on the 'net, and find him incredibly irritating, and precisely for these reasons. Having read some of Likoudis' nonsense, I'm left almost as unimpressed with him.
The truth is Bobby, there is no point trying to avoid the label "anti-Catholic", since no matter how nice you are, unless you're an ecumenical "we're both a lung of Christ's mystical body" love bunny, you'll be painted as being uncharitable and even hateful by these demagogues. Truth knows her children, and her children know her; those that will hear what you have to say (even using jest and humour), so long as you're not trying to be hateful, will hear you. Those who would not, it hardly matters what you do either way.