OK, I've updated the calculations for Hardened Armor, so check out the original post for that (now labeled 1). I've also added separate charts (see end of this or OP) for 2) hardened AV (RAW) vs hardened AV (does not ignore DV <= AV), 3) as 2 but with condition monitors of 8+Body, and 4) as 2 and 3 but for spirits, just for laughs.
All I can say is that while I have been playing Hardened Armor wrong (i.e. modified DV <= modified AV still damaged spirits), I think RAW Hardened Armor is just too strong. A Force 9 Spirit is nigh-invincible if you follow RAW where all DV is completely ignored unless it exceeds modified AV, with pretty much the Barret M122 with APDS rounds or an AV rocket the only thing that's able to even hurt it, and even then it would take one really good hit or two solid ones to take it out.
With that in mind, I also added a couple sheets of calculations comparing a possible houserule for Hardened Armor that would apply to vehicles, spirits, and character armor alike, where the only change is to remove the line about DV not exceeding Modified AV. As the charts will show, Hardnened Armor is still powerful, but it doesn't scale quite so exponentially and it means smaller caliber weaponry can chip away at such well-armored targets and eventually take them down, as opposed to the RAW version where you absolutely, positively need an AV rocket to deal with high AV targets. Again, this is just my preference so feel free to use or ignore, but just keep in mind that a Force 9 spirit, which in the grand scheme of things is powerful but hardly even close to what a min/maxed summoner can conjure, becomes an almost unstoppable force under RAW.
House Rule 1.1: Hardened Armor does not ignore modified DV that is less than or equal to modified AV
Reasoning: Hardened Armor as per RAW is just too strong for my taste; a Force 9 Spirit or an Ares Roadmaster with Hardened Armor become practically invincible to everything except AMRs and AV rockets. To my mind, this is a little overkill; with this houserule high-body, high-AV targets are still extremely resilient (more so when combined with house rule 2 that simplifies condition monitors), but with enough firepower they can now be harmed by non-APDS sniper rifles, assault cannons, HMGs, and lasers. It'll take volume of fire with these kinds of weapons to harm them, but given enough rounds (or beams) on target they can at least take such a target down eventually.
If nothing else, at least you now have a handy chart of all the comparisons
For reference, these are the updated tables:
1. Updated analysis comparing Vehicle AV to Hardened AV, with Hardened AV correctly (as per RAW) ignoring modified DV <= modified AV:
http://i.imgur.com/VWd7D1Y.jpg2. Updated analysis comparing Hardened AV (RAW) to Hardened AV that does not ignore modified DV <= modified AV:
http://i.imgur.com/NG940yQ.jpg3. Updated analysis same as 2 but with simplified condition monitors (8+Body) for drones and vehicles both:
http://i.imgur.com/rc88ZkK.jpg4. Updated analysis combining 2 and 3 but for Spirits:
http://i.imgur.com/iQ6sbMw.jpg