The problem is that the gravity itself is precisely what is giving you the yeast character you're getting. I usually will cite the difference between Weihenstephan Hefeweizen and Vitus. The mash conditions and fermentation conditions are almost identical on these beers, but the Vitus ester profile is far more expressive. Where the standard 5.4% weiss is characterized by a fairly subtle banana character (relative to ones like Hacker-Pschorr and Konig Ludwig), the 7.7% weizenbock is over-the-top with bananas, other fruits, and bubblegum which is more or less absent in the lower gravity example.
If I had to strategize a way to "cheat", you could maybe try lowering the grains and upping the % dextrose as that drives ester development independently of gravity, so you might be able to get the same results at 8% ABV vs 9.2%. Purely speculation of course.