First off, I think there may be an annoying syntax issue at hand--try removing the space between the comma and "full" and see if that helps (e.g., "rt:57,full" rather than "rt:57, full")

As far as applying different min-max values within the same trial, I don't if it will allow you to do that. If it does, that would be great, but my recollection is that it will use the first min-max value encountered for the trial. Please inform me if I am incorrect--and also if removing the space (above) does not help.