working on the forwardness of vocals, i just tweaked the equalizer in the playback software i'm using (i always leave this off, but for testing, i was curious) and found that by bumping the 110-220 hz zone just a touch, i was able to make the vocalists much more forward sounding.
Sounds to me like you have a response dip where the Stradas hand off to the subwoofer. This could either be a room suckout or a frequency response gap between the Stradas and the sub. *If that's the case*, then tweaking the EQ or attention to speaker placement would be the primary ways to fix it with your current speaker setup.
Another consideration: Gallo's cylindrical tweeter has a 330 degree dispersion--nearly omnidirectional. For room treatment and speaker placement You need to treat the Stradas like omni's. What I said about room treatment before goes double for omni's or ultra-wide dispersion speakers. I have Mirage omni's in my living room and I can control brightness and treble just by opening and closing curtains and blinds, as glass surfaces brighten the sound considerably and of course cloth curtains dampen it.
Also, Wilsons are known for fast, transparent midrange and an in-your-face presentation. They are designed to keep the room out of the listening equation as much as possible, while the Gallos are designed to bring the room *into* the soundstage formula. You have opposite philosophies and approaches to creating a soundstage and imaging from these two speaker companies.