I've just got a sec here. Here a few comments. Feel free to remind to answer anything I didn't answer:
--Well, as I often do, I didn't really answer your core question. The classic definition of Low Fat is around 10% of calories as fat. This is the level where the Ornish studies and Esselstyn's research show stellar arterial results.
--You have to realize one thing. Consuming the extra protein really isn't an Ornish or Esselstyn diet and has not really been studied. I can tell you almost for sure that Esselstyn would be opposed: he insists on normal protein levels through a plant-based diet. He knows that this will clear out a man's arteries and would not encourage anyone to consume a bunch of extra protein, especially animal, I am pretty sure. The pros and cons are a big subject.
--I actually consume a little more fat than this. I do have a small portion of sunflower seeds and/or nuts many days. It's kind of a long story why I do this, but this does not fit in perfectly with Ornish or Esselstyn. However, walnuts and almonds are good for the young guys, because they can significantly improve blood flow. If you're really trying to clear out your arteries, you probably want to skip them though.
--A "very low fat diet" in the literature is actually 15% or less generally and a low fat diet in the literature is actually around 20-25%. However, Ornish and Esselstyn kind of redefined what "low fat" is to around 10%. Confusing?? Sure, but that's the way it is. Also, there are no studies showing 20% of fat yields good arterial results as far as I know.
--I recommend testing, assuming you can afford it of course. I would not, for example, assume your blood pressure is good. Prehypertension is not something you "feel". You want that below 120/80. Also, stress can raise blood pressure into prehypertension even in your guys. I would recommend any man to do a little testing with a home glucose meter to check out his post-meal glucose surges. You really want to protect those beta cells. Glycated hemoglobin, fasting insulin, the ratio of triglycerides to HDL - the list could go on and on.
You need to slowly build up your knowledge as to how your body works. Are you going to treat it like a Corvette or a Ferrari? If so, it will run like one. If you treat it like a 30 year old beater, that's how it will run.
Without becoming obsessive or weird about it, you want to gradually build some base knowledge. I mean let's face it: the lion's share of doctors simply don't have time to help you manage prehypertension. And about three fourths of them don't even know the research that shows the risks of this and so they will tell you that actually have "good blood pressure". So get involved and get tested is my two cents or you will end up in their office 10 years later with full blown hypertension and on 2-3 medications that will chip away at your health as the decades roll by.
Anyway, it's really hard to talk about all of this without a thousand caveats. If you're exercising two hours per day or lifting super hard, then that is a whole other subject.