A relative newbie is lost on HOH vol II and +EV plays in MTT´s

[Alamo]

Hi all,

First post on this forum, have been lurking for quite a while.

Been playing poker for about a year now, but I really want and need to study to become better.
I have won 3 small (5+0,5) MTT´s so far, and seen quite a few final tables.

My questions are quite basic, so here goes-

In HOH vol.II, there is this thing called RALH, or RAHL, I do not have the book handy, but I guess the people who know the book know what I am talking about.

Is my assumption that this section of the book basically talks about the same methods applied in the Sit and Go Power tools?

If so, I am a bit lost here. Presuming that the Sit and Go powertools are exactly for that (for sit and go´s, one table), what is the difference between the methodology described in HOH vol II (which is obviously for MTT´s) and the SNGPT??

I have the feeling I might be mixing up things here...

And another question about +EV plays...

In a MTT, is it always correct to choose the +EV plays, even though they might be considered as coinflips, or do the good players sometimes choose for the lesser -EV play in order to stay alive in the tournament?

My reasoning here is of course that as +EV as a play might get, if you lose, you are out, or heavily crippled.

Given the fact that there might be better opportunities to wait for (unless short stacked), is the +EV play always mandatory?

I hope someone here can shed a light on this topic, cos straightforward as it seems, I do not seem to be able to get a definitive answer on this question.

Kind regards, and thanks in advance.