Area item levels

[LochnarITB]

I posted this over on the DSF where I was unable to get an answer. I've looked through the other technical archives on the AB and couldn't find an answer. Can someone here handle this query?

CarpetRubbr is coming up on NM act 3 and I was already planning on charm mining. CarpetRubbr has a pretty good collection of perfects in her own stash that I'll use if I find any. She could also use +res all. She's 80 in all now but will drop when she hits hell diff. A link that was posted about using charms this way (mostly refers to +res all but also mentions +skills) is this: Guide to Rerolling Res...

And, to expand on that, DeeBye, I have a request of you. Can you explain, or point me to better explanations, of just where all of the factors in these decisions can be found? I am getting it to some degree, but I have confusion in how to actually relate the various levels used in the calculation. For example:

   

Small Charms

    Best resists are alvl=40 (amber, emerald, ruby, sapphire: +10-11% to one element)
    Shimmering (+3-5% resist all) is alvl=33

    To get alvl=40 affixes, need charm of ilvl=54. At this ilvl:

Where can this affix level (alvl) be found? I thought this was the number listed in parenthesis on the Arreat Summit but the number doesn't match what is listed there. They then add 14. Why? Looking below that in the post they go on to add 8 for large charms and 0 for grand charms. I see that this final item level (ilvl) is then matched to the area level (in this post). I find that, now that I've explored this a little, I want to understand it.

Simple nudges with a link or downright spoon feeding would be much appreciated. Thanks.