I was originally creating profiles per class, but then ended up switching to an approach where I rate the item based on the highest primary (Str, Dex, Int) stat. It's not perfect, but it simplified things for me.

I don't know the exact number, but could probably figure it out with a couple queries. Based on some observations, I think the min Affix for a given item is roughly ilvl - 17. That would mean the lowest alvl for an ilvl 63 item is 46.

Not sure what you mean by "missing the affix part of the price". Affixes don't have prices so confused about what you are talking about here.

You're not going to figure it all out without looking at the decompiled ASM code from the game client. While the basic idea is simple, the implementation has a lot of tricky parts including extra rnd values being popped, the rnd function being re-seeded, special rules for when random armor offsets are applied, and you also need to know the implementation of the RandomFloat() function (which is a custom function).

maybe give some weight too vitality (specialy for HC)
and of course some weight to class specific skill bonuses

i would be curious about that i dont think it's a simple range, there must be special rules
it would mean that all chest armor ilvl 63 should have 3 socket or none (i never saw any of thoses http://www.d3lexicon.com/affix#socket-enhancement and the other one after aLvl 46 have 3 sockets) also i dont see pants socket after lvl 46

if you look at sell price of items, same items with same afixes have the same sell price (so not stat roll dependant) so it have to be a link between sell prices and affixes (and maybe the chance of an affix to roll)

if (!Description.ItemType.Is("FollowerSpecial"))
{
unknowValues.Add(randomizer.InternalNext());
if (ItemQuality > 5)
if (
Description.ItemType.Is("ChestArmor") || Description.ItemType.Is("Shoulders") || Description.ItemType.Is("Gloves") ||
Description.ItemType.Is("Legs") || Description.ItemType.Is("Boots") || Description.ItemType.Is("GenericHelm") ||
Description.ItemType.Is("VoodooMask")
)
unknowValues.Add(randomizer.InternalNext());
if (ItemCraftType <= 9)
{
if (Description.ItemArmorDelta > 0)
{
unknowValues.Add(randomizer.InternalNext());
float trueArmor = randomizer.RangeFloat(Description.ItemArmorBase, Description.ItemArmorBase + Description.ItemArmorDelta, unknowValues[unknowValues.Count - 1]);
double armor = Math.Round(trueArmor);
}
}
}

randomizer.Reseed();

if (Description.ItemType.Is("Weapon"))
{
unknowValues.Add(randomizer.InternalNext());
unknowValues.Add(randomizer.InternalNext());
float trueMinDmg = randomizer.RangeFloat(Description.ItemMinimumDamageBase, Description.ItemMinimumDamageBase + Description.ItemMinimumDamageDelta, unknowValues[unknowValues.Count - 2]);
float trueModDmg = randomizer.RangeFloat(Description.ItemDeltaDamageBase, Description.ItemDeltaDamageBase + Description.ItemDeltaDamageDelta, unknowValues[unknowValues.Count - 1]);
double minDmg = Math.Round(trueMinDmg);
double maxDmg = Math.Round(trueMinDmg + trueModDmg);
}

I don't know the exact number, but could probably figure it out with a couple queries. Based on some observations, I think the min Affix for a given item is roughly ilvl - 17. That would mean the lowest alvl for an ilvl 63 item is 46.

No.
-Lvlreq counts from the normal alvl.
So an item -17 lvlreq = 43 alvl.

still didnt find the 'why' to all thoses wasted calls ...

i'm starting to wonder if it's not some prg mechanism when high or low bit reach some value ...

-Lvlreq counts from the normal alvl.
So an item -17 lvlreq = 43 alvl.

from what i understand of the RandomFloat it should be somethng like this

There's a flag that determines whether a random delta needs to be applied or not.

and that flag is not a flag for crafted items ? (i think only those dont run on armor and dmg but i may be wrong)