I went from a 3U VT80 to a 3U VT-ZF and was glad I did. I get about the same amount of power but better accuracy with the VT-ZF compared to the VT80 at the sacrifice of a smaller sweet spot.
Note: the VT-ZF has a slightly smaller head frame than the VT80.
Interesting - sounds like you've been converted from VT-80 to Z-Force.
I've just played with the Z-Force tonight (3U), after enjoying the 3U VT-80 for the last 12 months or so. Not finding a big difference overall, although the Z-Force is strung with BG-65 strings and at a lower tension (even though I asked for 27 pounds, it feels/sounds more like 25-26). My VT-80 is strung with NBG99 strings (best strings I've tried for it so far), so I suppose it's not a fair comparison.
One thing for sure is that, for me, the Z-Force isn't a significant improvement over the VT-80. I really don't understand what you or others mean about better accuracy - that sounds like poor technique to be honest, rather than a racket flaw. Anyway, I'll see how it goes over the next few months. But as it stands right now, I'd definitely be getting another VT-80 if my current one breaks etc.