My point on the grind isn't so much doing a significant "re-grind". Most speed skis need to have the correct structure ground into the base at some point when they are new, if you're planning on racing and want a fast ski. What comes from the factory varies from nothing to a very generic grind, with most manufacturers. Some, regardless of the issue of the base bevel, like to ski-in the ski, give it them lot of love with waxing and brushing {or hot boxing cycles, and brushing}, with frequent skiing-in going on. It only takes a couple of gentle runs between waxing; no throwing them sideways. Then, you'd put the structure on them, based on where they'll be predominantly skied {East, West, humid, dry, warm, cold, etc.}, and do a bit more waxing and skiing. The ski should keep getting faster through this process, to a point. Then I'd treat them with care, not let a file near them {only stones} and let 'em rip. Others grind them right out of the wrapper. I think you end up in the same place, though a lot of seasoned techs that I know prefer the first approach.
I'd also make sure to pull the sidewalls well, and I'd take a panzer file to the topsheets, along with sandpaper, and round them off a bit as well. You want to go easy on that as too much can actually affect the flex. I think that this has been covered a number of times on this forum.
I haven't seen anything less than a 1 degree base bevel on a SG ski. I bet than 90% of them are set up that way, and that over time some of the bevel gets worked down to about 1.5%. Often in the tips, I've seen. My son has a pair of SG's that were passed to him via the WC pool. So, tuned by a WC tech for a WC skier. Bases look incredible. Very little edge. We measured the base bevel for kicks. Anywhere from 1 degree to about 1.4, and it varied all over the place. I think others have made the point correctly that you don't want them to hook up. You do not want to be overturning, and not releasing your turns in an SG, either. That's key, and it varies based on the skier and the skill.
I've also seen SG skis for younger juniors, like first year J3's, tuned with a 1.5 degree base, presumably to ease with the learning curve. These are kids who clearly have a 1 degree bevel on their tech skis.
Another unfortunate reality is that SG, and DH are different disciplines and require training and coaching to improve. Not a lot of SG training takes place unless you're on snow pretty much full time, in many parts of the country. SG is for my money the best event. Inspect, and take one run. Takes a lot of skill to do well. Sad that we don't schedule more of it in this country. It's hard to build that skill doing one or two a year, with little or no training.
Hope the owner of these Blizzards loves them! Very, very nice ride!! Have fun dialing in the long turn on them, and be careful if and when you're free skiing them. Most recreational skiers do not anticipate anybody making SG sized turns, let alone at SG speeds. A collision would be a disaster. Best to do it on buffed trails that are nearly empty, IMO.