I have the sport package, but I rarely use the SRM. When I do use it, I never notice rev-matching on upshifts? I'm not sure I understand how rev-matching on upshifts would hold RPM stable ...
Consider: There are three linked factors -- gear, RPMS, and Speed. When rev-matching on the down-shift I think the system assumes you want the same speed and matches the revs according to the gear you select.
But, if it does the same thing upshifting, that would imply reducing the revs not holding them constant. If it is holding the revs constant on upshift, it must be making some assumption that you want to increase speed. Frankly, I doubt it would do that --
It may be something that isn't properly called "rev-matching" is going on when you upshift. The system may be preventing the RPMs from falling too much during the upshift (though I've never noticed this -- likely because I am applying throttle
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