C-More Trend - Auto Adjust Y axis?

[The Turkey Slayer]

I have an application where I'm reading a pressure, evaluating it against a calibrated value, and logging it on a trigger (so times are not uniform between readings) with a trend object on a C-More panel. I realize there's no option for it, but the problem I'm running into is that the pressure from batch to batch could range anywhere from 20 to 60 or so psi on average, BUT between parts in the same batch the difference is only 10ths or even 100ths of a PSI. So what I'm going to run into is I'm going to have a trend object with straight lines (not very helpful, especially when there's such little difference between pass and fail in this application) and I'd really like to have the graph adjust to the current range. Even if there was a way to manually adjust the scale, it'd be a huge help. If there's no way it's not a deal-breaker though. The primary reason for it being there is to log data and I understand it will do that accurately regardless.

[b_carlton]

Can you generate a 'difference from expected average reading' in the PLC and display that also?