LeoD,
I appreciate your efforts on this, but I haven't really had any problems with my VH using my own e.q. settings, which by the way DO increase the highs quite a bit.
I seldom have time to bring the Tyros into the house and "play" with it. Our moderate weather this time of year allows me to leave it in the van for the next day's job. However, I will try the settings exactly as you say, to back up your research as soon as possible.
Regarding e.q.: The long-time accepted theory of e.q. is that it is best used for cutting frequencies that are not wanted, rather than increasing frequencies, because increasing the highs artificially can add noise to the sound. It has long been acknowledged that it is best to create the "curve" that you want, for example, by cutting the lows more than increasing the highs, or at least a combination of both rather than boosting all highs. Having said this, the Tyros e.q. setup might well be an exception to this theory, but looking at my "curve" it seems to mirror yours, but by decreasing instead of boosting some of the bands.
In any case, if it works for you, don't try to fix it!
DonM