Yamaha Tyros 4 own an amazing effects module + strong synths caps + the megavoices + SA2... so you will never get the same results if you don't have a Tyros or an emulation who does'nt exists today.
It's just cool to be able to play Ketron styles with their live drums, and play Yamaha T4 styles that you like on one touch of a button, on the same system.
It's not 100% perfect with Yamaha styles, but useable. It's 100% perfect with Ketron styles on Ketron sound modules.
Diki, I lowered a little bit thoses intro horns, because I prefer like that, but your are the second one who tell me that they are undermixed

so maybe it's my ear...
The curves you are telling are now more specified in the latest official GM documents. But not all manufacturers are following them.
What I usually do when I want to use a style for my styleset, is remixing a little bit the volumes pan & FX to be perfect to my ear. It is very easy on vArranger, because everything is on the screen. You move some faders & kobs on the screen and save the style.
Note that the Yamaha style is never converted by vArranger, but played as it should be by the Tyros 4, with some algorytms to adapt them to Ketron SD2 and GM/XG synths.
Maybe vArranger should play perfectly the Yamaha styles on the Motif XF rack
