JAMAS--- The main reason a certain Grabber AT2 is not Snowflake/Mountain rated is primarily due to a combination of both "narrow tread width" and "shallow tread depth". Not all of the tire data is accurate on the TireRack website, although it's great for determining which are Snowflake/Mountain rated and which aren't. For accurate data, you need to go to the actual manufacturer website of GENERAL TIRE - USA.
For example, the Grabber AT2 in P255/60R18 (30" O.D./39 lbs) has a tread depth of only 13/32nds (per factory website). The AT2 in P265/70R18 (32" O.D./46 lbs) has a tread depth of 17/32nds. Obvisously; the deeper tread depth of 17/32nds is going to give the tire more biting traction, and will last longer before it finally reaches the tire's wear bars.
By contrast; the Snowflake/Mountain rated PRO-COMP - All Terrain in P285/60R18 (31.3" O.D./43 lbs) has a tread depth of 12/32nds (shallower than the 13/32nds of the AT2), but since it's also a wide 285 series tire, it has more tire patch area on the road surface enabling greater overall traction. Thus, it earned the Snowflake/Mountain rating.
I get the impression from your postings, that you favor a narrower tire in the 255--265 series width range, and one that is also Snowflake/Mountain rated. Given those parameters, the Grabber AT2 in P265/70R18 (32" O.D./46 lbs) might be an option for you. This particular tire will give you 1.25" increased ground clearance over stock, and comes in OWL for additional tire bling. It will easily fit on a stock non-lifted VX with only possible minor trimming of the front cladding if mounted on OEM 18x7 VX rims. It will also nicely "fill-up" the large gaps between tire and fender within the wheelwells.
If you decide to go with the smaller non-Snowflake/Mountain rated Grabber AT2 in size P255/60R18 (30" O.D./39 lbs) with 13/32nds tread depth, they will still dig like crazy in the snow and offer superior traction. It narrowly missed-out being Snowflake/Mountain rated by only 1/32nds of tread depth. If the tire had 14/32nds, it would have attained the Snowflake/Mountain rating. The really cool thing about the Grabber AT2 in P255/60R18 is that it weighs only 39 lbs!!! This is only 5 lbs over stock OEM tire weight-- virtually unheard of in an aggressive A/T tire and will greatly help maintain the VX's original quick-n-nimble sportiness performance.
Just a few days ago, I mounted the Grabber AT2 in P275/65R18 (32" O.D./44 lbs) on the stock OEM 18x7 rims. They fit bolt-on perfect on my 100% stock VX without any modification, except for some minor trimming on the front edge of cladding. No "lifting" of any kind is required, and no front torsion bar cranks.
In every possible tire catagory, the Grabber AT2 blows away the competition. It is without a doubt; the very best A/T tire for the VX, period.