I switched from 2018 Vapors to the ASV skates last winter and really had no issues. Love them, although I will note that I went down half a size in the CCMs. I've always skated on a 9' radius, and more recently, a 15/30 or 20/40 cag profile. All Step steel comes with a 10' radius stock, so if you were on 10' on your Vapors, you shouldn't notice a big difference.
I would give you 3 recommendations -
1. The ASVs are STIFF. Don't tie them as tight at the top, which will give you more forward and lateral flexibility. I figured this out pretty quickly.
2. Consider aftermarket insoles like Superfeet, which should help put you more on the balls of your feet.
3. If those both fail to make a difference, take both your Vapors and your Tacks into a knowledgeable skate shop and have them try to emulate whatever profile is currently on your Vapors. I had my Vapors profiled fairly recently before buying my ASVs and I really did not experience what you're talking about, so I wonder if it's a result of how your Vapors were profiled.